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Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 LAMPS Working Group D.K. Gillmor 3 Internet-Draft American Civil Liberties Union 4 Intended status: Standards Track B. Hoeneisen 5 Expires: 28 November 2021 pEp Foundation 6 A. Melnikov 7 Isode Ltd 8 27 May 2021 10 Header Protection for S/MIME 11 draft-ietf-lamps-header-protection-05 13 Abstract 15 S/MIME version 3.1 has introduced a feasible standardized option to 16 accomplish Header Protection. However, few implementations generate 17 messages using this structure, and several legacy and non-legacy 18 implementations have revealed rendering issues at the receiving side. 19 Clearer specifications regarding message processing, particularly 20 with respect to header sections, are needed in order to resolve these 21 rendering issues. Some mail user agents are also sending and 22 receiving cryptographically-protected message headers using a 23 different structure. 25 In order to help implementers to correctly compose and render email 26 messages with Header Protection, this document updates S/MIME Header 27 Protection specifications with additional guidance on MIME format, 28 sender and receiver processing. 30 Status of This Memo 32 This Internet-Draft is submitted in full conformance with the 33 provisions of BCP 78 and BCP 79. 35 Internet-Drafts are working documents of the Internet Engineering 36 Task Force (IETF). Note that other groups may also distribute 37 working documents as Internet-Drafts. The list of current Internet- 38 Drafts is at https://datatracker.ietf.org/drafts/current/. 40 Internet-Drafts are draft documents valid for a maximum of six months 41 and may be updated, replaced, or obsoleted by other documents at any 42 time. It is inappropriate to use Internet-Drafts as reference 43 material or to cite them other than as "work in progress." 45 This Internet-Draft will expire on 28 November 2021. 47 Copyright Notice 49 Copyright (c) 2021 IETF Trust and the persons identified as the 50 document authors. All rights reserved. 52 This document is subject to BCP 78 and the IETF Trust's Legal 53 Provisions Relating to IETF Documents (https://trustee.ietf.org/ 54 license-info) in effect on the date of publication of this document. 55 Please review these documents carefully, as they describe your rights 56 and restrictions with respect to this document. Code Components 57 extracted from this document must include Simplified BSD License text 58 as described in Section 4.e of the Trust Legal Provisions and are 59 provided without warranty as described in the Simplified BSD License. 61 Table of Contents 63 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5 64 1.1. Two Schemes of Protected Headers . . . . . . . . . . . . 5 65 1.2. Problems with Wrapped Messages . . . . . . . . . . . . . 6 66 1.3. Problems with Injected Headers . . . . . . . . . . . . . 6 67 1.4. Motivation . . . . . . . . . . . . . . . . . . . . . . . 6 68 1.5. Other Protocols to Protect Email Headers . . . . . . . . 7 69 1.6. Requirements Language . . . . . . . . . . . . . . . . . . 7 70 1.7. Terms . . . . . . . . . . . . . . . . . . . . . . . . . . 7 71 2. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 10 72 2.1. Privacy . . . . . . . . . . . . . . . . . . . . . . . . . 10 73 2.2. Security . . . . . . . . . . . . . . . . . . . . . . . . 11 74 2.3. Usability . . . . . . . . . . . . . . . . . . . . . . . . 11 75 2.4. Interoperability . . . . . . . . . . . . . . . . . . . . 11 76 3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 11 77 3.1. Interactions . . . . . . . . . . . . . . . . . . . . . . 11 78 3.1.1. Main Use Case . . . . . . . . . . . . . . . . . . . . 11 79 3.1.2. Backward Compatibility Use Cases . . . . . . . . . . 11 80 3.2. Protection Levels . . . . . . . . . . . . . . . . . . . . 13 81 3.2.1. In-Scope . . . . . . . . . . . . . . . . . . . . . . 13 82 3.2.2. Out-of-Scope . . . . . . . . . . . . . . . . . . . . 13 83 4. Specification . . . . . . . . . . . . . . . . . . . . . . . . 13 84 4.1. Main Use Case . . . . . . . . . . . . . . . . . . . . . . 14 85 4.1.1. MIME Format . . . . . . . . . . . . . . . . . . . . . 14 86 4.1.2. Sending Side . . . . . . . . . . . . . . . . . . . . 17 87 4.1.3. Default Header Confidentiality Policy . . . . . . . . 22 88 4.1.4. Receiving Side . . . . . . . . . . . . . . . . . . . 23 89 4.2. Backward Compatibility Use Cases . . . . . . . . . . . . 31 90 4.2.1. Receiving Side MIME-Conformant . . . . . . . . . . . 32 91 4.2.2. Receiving Side Not MIME-Conformant . . . . . . . . . 32 92 5. Usability Considerations . . . . . . . . . . . . . . . . . . 33 93 5.1. Mixed Protections Within a Message Are Hard To 94 Understand . . . . . . . . . . . . . . . . . . . . . . . 33 96 5.2. Users Should Not Have To Choose a Header Confidentiality 97 Policy . . . . . . . . . . . . . . . . . . . . . . . . . 33 98 6. Security Considerations . . . . . . . . . . . . . . . . . . . 33 99 7. Privacy Considerations . . . . . . . . . . . . . . . . . . . 33 100 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 33 101 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 33 102 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 33 103 10.1. Normative References . . . . . . . . . . . . . . . . . . 33 104 10.2. Informative References . . . . . . . . . . . . . . . . . 34 105 Appendix A. Test Vectors . . . . . . . . . . . . . . . . . . . . 36 106 A.1. Baseline Messages . . . . . . . . . . . . . . . . . . . . 36 107 A.1.1. No cryptographic protections over a simple message . 36 108 A.1.2. S/MIME signed-only signedData over a simple message, No 109 Header Protection . . . . . . . . . . . . . . . . . . 37 110 A.1.3. S/MIME signed-only multipart/signed over a simple 111 message, No Header Protection . . . . . . . . . . . . 39 112 A.1.4. S/MIME encrypted and signed over a simple message, No 113 Header Protection . . . . . . . . . . . . . . . . . . 41 114 A.1.5. No cryptographic protections over a complex 115 message . . . . . . . . . . . . . . . . . . . . . . . 44 116 A.1.6. S/MIME signed-only signedData over a complex message, 117 No Header Protection . . . . . . . . . . . . . . . . 45 118 A.1.7. S/MIME signed-only multipart/signed over a complex 119 message, No Header Protection . . . . . . . . . . . . 47 120 A.1.8. S/MIME encrypted and signed over a complex message, No 121 Header Protection . . . . . . . . . . . . . . . . . . 50 122 A.2. Signed-only Messages . . . . . . . . . . . . . . . . . . 54 123 A.2.1. S/MIME signed-only signedData over a simple message, 124 Wrapped Message . . . . . . . . . . . . . . . . . . . 54 125 A.2.2. S/MIME signed-only multipart/signed over a simple 126 message, Wrapped Message . . . . . . . . . . . . . . 56 127 A.2.3. S/MIME signed-only signedData over a simple message, 128 Injected Headers . . . . . . . . . . . . . . . . . . 58 129 A.2.4. S/MIME signed-only multipart/signed over a simple 130 message, Injected Headers . . . . . . . . . . . . . . 60 131 A.2.5. S/MIME signed-only signedData over a complex message, 132 Wrapped Message . . . . . . . . . . . . . . . . . . . 62 133 A.2.6. S/MIME signed-only multipart/signed over a complex 134 message, Wrapped Message . . . . . . . . . . . . . . 64 135 A.2.7. S/MIME signed-only signedData over a complex message, 136 Injected Headers . . . . . . . . . . . . . . . . . . 67 137 A.2.8. S/MIME signed-only multipart/signed over a complex 138 message, Injected Headers . . . . . . . . . . . . . . 70 139 A.3. Encrypted-and-signed Messages . . . . . . . . . . . . . . 73 140 A.3.1. S/MIME encrypted and signed over a simple message, 141 Wrapped Message with hcp_minimal . . . . . . . . . . 73 142 A.3.2. S/MIME encrypted and signed over a simple message, 143 Injected Headers with hcp_minimal . . . . . . . . . . 76 145 A.3.3. S/MIME encrypted and signed over a simple message, 146 Injected Headers with hcp_minimal (+ Legacy Display) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 147 A.3.4. S/MIME encrypted and signed over a simple message, 148 Wrapped Message with hcp_strong . . . . . . . . . . . 82 149 A.3.5. S/MIME encrypted and signed over a simple message, 150 Injected Headers with hcp_strong . . . . . . . . . . 85 151 A.3.6. S/MIME encrypted and signed over a simple message, 152 Injected Headers with hcp_strong (+ Legacy Display) . 88 153 A.3.7. S/MIME encrypted and signed reply over a simple 154 message, Wrapped Message with hcp_minimal . . . . . . 91 155 A.3.8. S/MIME encrypted and signed reply over a simple 156 message, Injected Headers with hcp_minimal . . . . . 94 157 A.3.9. S/MIME encrypted and signed reply over a simple 158 message, Injected Headers with hcp_minimal (+ Legacy 159 Display) . . . . . . . . . . . . . . . . . . . . . . 97 160 A.3.10. S/MIME encrypted and signed reply over a simple 161 message, Wrapped Message with hcp_strong . . . . . . 101 162 A.3.11. S/MIME encrypted and signed reply over a simple 163 message, Injected Headers with hcp_strong . . . . . . 104 164 A.3.12. S/MIME encrypted and signed reply over a simple 165 message, Injected Headers with hcp_strong (+ Legacy 166 Display) . . . . . . . . . . . . . . . . . . . . . . 107 167 A.3.13. S/MIME encrypted and signed over a complex message, 168 Wrapped Message with hcp_minimal . . . . . . . . . . 110 169 A.3.14. S/MIME encrypted and signed over a complex message, 170 Injected Headers with hcp_minimal . . . . . . . . . . 114 171 A.3.15. S/MIME encrypted and signed over a complex message, 172 Injected Headers with hcp_minimal (+ Legacy Display) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 173 A.3.16. S/MIME encrypted and signed over a complex message, 174 Wrapped Message with hcp_strong . . . . . . . . . . . 122 175 A.3.17. S/MIME encrypted and signed over a complex message, 176 Injected Headers with hcp_strong . . . . . . . . . . 125 177 A.3.18. S/MIME encrypted and signed over a complex message, 178 Injected Headers with hcp_strong (+ Legacy Display) . 129 179 A.3.19. S/MIME encrypted and signed reply over a complex 180 message, Wrapped Message with hcp_minimal . . . . . . 133 181 A.3.20. S/MIME encrypted and signed reply over a complex 182 message, Injected Headers with hcp_minimal . . . . . 137 183 A.3.21. S/MIME encrypted and signed reply over a complex 184 message, Injected Headers with hcp_minimal (+ Legacy 185 Display) . . . . . . . . . . . . . . . . . . . . . . 141 186 A.3.22. S/MIME encrypted and signed reply over a complex 187 message, Wrapped Message with hcp_strong . . . . . . 145 188 A.3.23. S/MIME encrypted and signed reply over a complex 189 message, Injected Headers with hcp_strong . . . . . . 149 190 A.3.24. S/MIME encrypted and signed reply over a complex 191 message, Injected Headers with hcp_strong (+ Legacy 192 Display) . . . . . . . . . . . . . . . . . . . . . . 153 194 Appendix B. Additional information . . . . . . . . . . . . . . . 157 195 B.1. Stored Variants of Messages with Bcc . . . . . . . . . . 157 196 Appendix C. Text Moved from Above . . . . . . . . . . . . . . . 158 197 C.1. MIME Format . . . . . . . . . . . . . . . . . . . . . . . 158 198 C.1.1. S/MIME Specification . . . . . . . . . . . . . . . . 159 199 C.1.2. Sending Side . . . . . . . . . . . . . . . . . . . . 161 200 Appendix D. Document Considerations . . . . . . . . . . . . . . 165 201 Appendix E. Document Changelog . . . . . . . . . . . . . . . . . 166 202 Appendix F. Open Issues . . . . . . . . . . . . . . . . . . . . 167 203 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 168 205 1. Introduction 207 Privacy and security issues regarding email Header Protection in S/ 208 MIME have been identified for some time. Most current 209 implementations of cryptographically-protected electronic mail 210 protect only the body of the message, which leaves significant room 211 for attacks against otherwise-protected messages. For example, lack 212 of header protection allows an attacker to substitute the message 213 subject and/or author. 215 This document describes two different structures for how message 216 headers can be cryptographically protected, and provides guidance for 217 implementers of MUAs that generate and interpret such messages. It 218 takes particular care to ensure that messages interact reasonably 219 well with legacy MUAs. 221 1.1. Two Schemes of Protected Headers 223 Unfortunately, there are two different schemes for cryptographically- 224 protected email headers that may be in use on the Internet today. 225 This document addresses them both and provides guidance to 226 implementers. 228 One scheme is the form specified in S/MIME 3.1 and later, which 229 involves wrapping a "message/rfc822" MIME object with a Cryptographic 230 Envelope. This document calls this scheme "Wrapped Message", and it 231 is documented in more detail in [RFC8551]. Experience has shown that 232 this form does not interact well with some legacy MUAs (see 233 Section 1.2). 235 Consequently, another form of header protection is produced and 236 consumed by some MUAs, where the protected headers are placed 237 directly on the Cryptographic Payload, without using an intervening 238 "message/*" MIME object. This document calls this scheme "Injected 239 Headers", and it is documented in more detail in 240 [I-D.autocrypt-lamps-protected-headers]. 242 1.2. Problems with Wrapped Messages 244 Several legacy MUAs have revealed rendering issues when dealing with 245 a message with headers protected by the Wrapped Message scheme. In 246 some cases the user sees an attachment suggesting a forwarded email 247 message, which -- in fact -- contains the protected email message 248 that should be rendered directly. For these cases, the user can 249 click on the attachment to view the protected message. However, 250 there have also been reports of email clients displaying garbled 251 text, or sometimes nothing at all. In those cases the email clients 252 on the receiving side are (most likely) not fully MIME-capable. 254 The following shortcomings have been identified to cause these 255 issues: 257 * Broken or incomplete implementations 259 * Lack of a simple means to distinguish "forwarded message" and 260 "wrapped message" (for the sake of Header Protection) 262 * Not enough guidance with respect to handling of Header Fields on 263 both the sending and the receiving side 265 1.3. Problems with Injected Headers 267 A legacy MUA dealing with an encrypted message that has some header 268 fields obscured using the Injected Headers scheme will not render the 269 obscured header fields to the user at all. A workaround "legacy 270 display" mechanism is provided in this document, which some legacy 271 MUAs will render to the user, albeit not in the same location that 272 the header fields would normally be rendered. However, some legacy 273 MUAs also fail to render the "legacy display" part, leaving the 274 obscured header fields hidden from users of those MUAs. 276 1.4. Motivation 278 Furthermore, the need (technical) Data Minimization, which includes 279 data sparseness and hiding all technically concealable information, 280 has grown in importance over the past several years. In addition, 281 backwards compatibility must be considered when it is possible to do 282 so without compromising privacy and security. 284 No mechanism for Header Protection has been standardized for PGP/MIME 285 (Pretty Good Privacy) [RFC3156] yet. PGP/MIME developers have 286 implemented ad-hoc header-protection, and would like to see a 287 specification that is applicable to both S/MIME and PGP/MIME. 289 This document describes the problem statement (Section 2), generic 290 use cases (Section 3) and the specification for Header Protection 291 (Section 4) with guidance on MIME format, sender and receiver 292 processing . 294 [I-D.ietf-lamps-header-protection-requirements] defines the 295 requirements that this specification is based on. 297 This document is in an early draft state and contains a proposal on 298 which to base future discussions of this topic. In any case, the 299 final mechanism is to be determined by the IETF LAMPS WG. 301 1.5. Other Protocols to Protect Email Headers 303 A range of protocols for the protection of electronic mail (email) 304 exists, which allows one to assess the authenticity and integrity of 305 the email headers section or selected Header Fields from the domain- 306 level perspective, specifically DomainKeys Identified Mail (DKIM) 307 [RFC6376], as used by Domain-based Message Authentication, Reporting, 308 and Conformance (DMARC) [RFC7489]. These protocols provide a domain- 309 based reputation mechanism that can be used to mitigate some forms of 310 unsolicited email (spam). At the same time, these protocols can 311 provide a level of cryptographic integrity and authenticity for some 312 headers, depending on how they are used. However, integrity 313 protection and proof of authenticity are both tied to the domain name 314 of the sending e-mail address, not the sending address itself, so 315 these protocols do not provide end-to-end protection, and are 316 incapable of providing any form of confidentiality. 318 1.6. Requirements Language 320 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 321 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 322 document are to be interpreted as described in [RFC2119]. 324 1.7. Terms 326 The following terms are defined for the scope of this document: 328 * Man-in-the-middle (MITM) attack: cf. [RFC4949], which states: "A 329 form of active wiretapping attack in which the attacker intercepts 330 and selectively modifies communicated data to masquerade as one or 331 more of the entities involved in a communication association." 333 Note: Historically, MITM has stood for '_Man_-in-the-middle'. 334 However, to indicate that the entity in the middle is not always a 335 human attacker, MITM can also stand for 'Machine-in-the-middle' or 336 'Meddler-in-the-middle'. 338 * S/MIME: Secure/Multipurpose Internet Mail Extensions (cf. 339 [RFC8551]) 341 * PGP/MIME: MIME Security with OpenPGP (cf. [RFC3156]) 343 * Message: An Email Message consisting of Header Fields 344 (collectively called "the Header Section of the message") 345 followed, optionally, by a Body; cf. [RFC5322]. 347 Note: To avoid ambiguity, this document does not use the terms 348 "Header" or "Headers" in isolation, but instead always uses 349 "Header Field" to refer to the individual field and "Header 350 Section" to refer to the entire collection; cf. [RFC5322]. 352 * Header Field (HF): cf. [RFC5322] Header Fields are lines beginning 353 with a field name, followed by a colon (":"), followed by a field 354 body (value), and terminated by CRLF. 356 * Header Section (HS): The Header Section is a sequence of lines of 357 characters with special syntax as defined in [RFC5322]. It is the 358 (top) section of a Message containing the Header Fields. 360 * Body: The Body is simply a sequence of bytes that follows the 361 Header Section and is separated from the Header Section by an 362 empty line (i.e., a line with nothing preceding the CRLF); cf 363 [RFC5322]. It is the (bottom) section of Message containing the 364 payload of a Message. Typically, the Body consists of a (possibly 365 multipart) MIME [RFC2045] construct. 367 * MIME Header Fields: Header Fields describing content of a MIME 368 entity [RFC2045], in particular the MIME structure. Each MIME 369 Header Field name starts with "Content-" prefix. 371 * MIME Header Section (part): The collection of MIME Header Fields. 372 "MIME Header Section" refers to a Header Sections that contains 373 only MIME Header Fields, whereas "MIME Header Section part" refers 374 to the MIME Header Fields of a Header Section that - in addition 375 to MIME Header Fields - also contains non-MIME Header Fields. 377 * Essential Header Fields (EHF): The minimum set of Header Fields an 378 Outer Message Header Section SHOULD contain; cf. Appendix C.1.2.5. 380 * Header Protection (HP): cryptographic protection of email Header 381 Sections (or parts of it) for signatures and/or encryption 383 * Protection Levels (PL): The level of protection applied to a 384 Message, e.g. 'signature and encryption' or 'signature only' (cf. 385 Section 3.2). 387 * Protected: Portions of a message that have had any Protection 388 Levels applied. 390 * Protected Message: A Message that has had any Protection Levels 391 applied. 393 * Unprotected: Portions of a Message that has had no Protection 394 Levels applied. 396 * Unprotected Message: A Message that has had no Protection Levels 397 applied. 399 * Submission Entity: The entity which executes further processing of 400 the Message (incl. transport towards the receiver), after 401 protection measures have been applied to the Message. 403 Note: The Submission Entity varies among implementations, mainly 404 depending on the stage where protection measures are applied: E.g. 405 a Message Submission Agent (MSA) [RFC6409] or another 406 (proprietary) solution. The latter is particularly relevant, if 407 protection is implemented as a plugin solution. Some 408 implementations may determine the destination recipients by 409 reading the To, Cc and Bcc Header Fields of the Outer Message. 411 * Original Message (OrigM): The Message to be protected before any 412 protection-related processing has been applied on the sending 413 side. If the source is not a "message/rfc822" Message, OrigM is 414 defined as the "virtual" Message that would be constructed for 415 sending it as unprotected email. 417 * Inner Message (InnerM): The Message to be protected which has had 418 wrapping and protection measures applied on the sending side OR 419 the resulting Message once decryption and unwrapping on the 420 receiving side has been performed. Typically, the Inner Message 421 is in clear text. The Inner Message is a subset of (or the same 422 as) the Original Message. The Inner Message must be the same on 423 the sending and the receiving side. 425 * Outer Message (OuterM): The Message as provided to the Submission 426 Entity or received from the last hop respectively. The Outer 427 Message normally differs on the sending and the receiving side 428 (e.g. new Header Fields are added by intermediary nodes). 430 * Receiving User Facing Message (RUFM): The Message used for 431 rendering at the receiving side. Typically this is the same as 432 the Inner Message. 434 * Data Minimization: Data sparseness and hiding of all technically 435 concealable information whenever possible. 437 * Cryptographic Layer, Cryptographic Payload, Cryptographic 438 Envelope, Structural Headers, and MUA are all used as defined in 439 [I-D.dkg-lamps-e2e-mail-guidance] 441 * User-Facing Headers are defined in 442 [I-D.autocrypt-lamps-protected-headers]. 444 * Legacy MUA: a MUA that does not understand protected headers as 445 described in this document. A Legacy Non-Crypto MUA is incapable 446 of doing any end-to-end cryptographic operations. A Legacy Crypto 447 MUA is capable of doing cryptographic operations, but does not 448 understand or generate protected headers. 450 * Wrapped Message: The protected headers scheme that uses the 451 mechanism described in [RFC8551], where the Cryptographic Payload 452 is a "message/rfc822" or "message/global" MIME object. 454 * Injected Headers: The protected headers scheme that uses the 455 mechanism described in [I-D.autocrypt-lamps-protected-headers], 456 where the protected headers are inserted on the Cryptographic 457 Payload directly. 459 * Header Confidentiality Policy: documented in Section 4.1.2.2 461 2. Problem Statement 463 The LAMPS charter contains the following Work Item: 465 Update the specification for the cryptographic protection of email 466 headers -- both for signatures and encryption -- to improve the 467 implementation situation with respect to privacy, security, 468 usability and interoperability in cryptographically-protected 469 electronic mail. Most current implementations of 470 cryptographically-protected electronic mail protect only the body 471 of the message, which leaves significant room for attacks against 472 otherwise-protected messages. 474 In the following a set of challenges to be addressed: 476 [[ TODO: Enhance this section, add more items to the following. ]] 478 2.1. Privacy 480 * (Technical) Data Minimization, which includes data sparseness and 481 hiding all technically concealable information whenever possible 483 2.2. Security 485 * Prevent MITM attacks (cf. [RFC4949]) 487 2.3. Usability 489 * Improved User interaction / User experience, in particular at the 490 receiving side 492 2.4. Interoperability 494 * Interoperability with [RFC8551] implementations 496 3. Use Cases 498 In the following, the reader can find a list of the generic use cases 499 that need to be addressed for Messages with Header Protection (HP). 500 These use cases apply regardless of technology (S/MIME, PGP/MIME, 501 etc.) used to achieve HP. 503 3.1. Interactions 505 The following use cases assume that at least the sending side 506 supports Header Protection as specified in this document. Receiving 507 sides that support this specification are expected to be able to 508 distinguish between Messages that use Header Protection as specified 509 in this document, and (legacy) Mail User Agents (MUAs) which do not 510 implement this specification. 512 [[ TODO: Verify once solution is stable and update last sentence. ]] 514 3.1.1. Main Use Case 516 Both the sending and receiving side (fully) support Header Protection 517 as specified in this document. 519 The main use case is specified in Section 4.1. 521 3.1.2. Backward Compatibility Use Cases 523 Regarding backward compatibility, the main distinction is based on 524 whether or not the receiving side conforms to MIME according to 525 [RFC2046], ff., which in particular also includes Section 2 of 526 [RFC2049] on "MIME Conformance". The following excerpt is 527 contextually relevant: 529 A mail user agent that is MIME-conformant MUST: 531 [...] 533 -- Recognize and display at least the RFC822 message 534 encapsulation (message/rfc822) in such a way as to 535 preserve any recursive structure, that is, displaying 536 or offering to display the encapsulated data in 537 accordance with its media type. 539 -- Treat any unrecognized subtypes as if they were 540 "application/octet-stream". 542 [...] 544 An MUA that meets the above conditions is said to be MIME- 545 conformant. A MIME-conformant MUA is assumed to be "safe" to 546 send virtually any kind of properly-marked data to users of 547 such mail systems, because these systems are, at a minimum, 548 capable of treating the data as undifferentiated binary, and 549 will not simply splash it onto the screen of unsuspecting 550 users. 552 [[ TODO: The compatibility of legacy HP systems with this new 553 solution, and how to handle issues surrounding future maintenance for 554 these legacy systems, will be decided by the LAMPS WG. ]] 556 3.1.2.1. Receiving Side MIME-Conformant 558 The sending side (fully) supports Header Protection as specified in 559 this document, while the receiving side does not support this 560 specification. However, the receiving side is MIME-conformant 561 according to [RFC2045], ff. (cf. Section 3.1.2). 563 This use case is specified in Section 4.2.1. 565 Note: This case should perform as expected if the sending side 566 applies this specification as outlined in Section 4.1. 568 [[ TODO: Verify once solution is stable and update last sentence. ]] 570 3.1.2.2. Receiving Side Not MIME-Conformant 572 The sending side (fully) supports Header Protection as specified in 573 this document, while the receiving side does not support this 574 specification. Furthermore, the receiving side is *not* MIME- 575 conformant according to [RFC2045], ff. (cf. Section 3.1.2). 577 This use case is specified in Section 4.2.2. 579 3.2. Protection Levels 581 3.2.1. In-Scope 583 The following Protection Levels are in scope for this document: 585 a) Signature and encryption 587 Messages containing a cryptographic signature, which are also 588 encrypted. 590 b) Signature only 592 Messages containing a cryptographic signature, but which are not 593 encrypted. 595 3.2.2. Out-of-Scope 597 Legacy implementations, implementations not (fully) compliant with 598 this document or corner-cases may lead to further Protection Levels 599 to appear on the receiving side, such as (list not exhaustive): 601 * Triple wrap 603 * Encryption only 605 * Encryption before signature 607 * Signature and encryption, but: 609 - Signature fails to validate 611 - Signature validates but the signing certificate revoked 613 * Signature only, but: 615 - with multiple valid signatures, layered atop each other 617 These Protection Levels, as well as any further Protection Levels not 618 listed in Section 3.2.1 are beyond the scope of this document. 620 4. Specification 622 This section contains the specification for Header Protection in S/ 623 MIME to update and clarify Section 3.1 of [RFC8551] (S/MIME 4.0). 625 Note: It is likely that PGP/MIME [RFC3156] will also incorporate this 626 specification or parts of it. 628 This specification applies to the Protection Levels "signature & 629 encryption" and "signature only" (cf. Section 3.2): 631 Sending and receiving sides MUST implement the "signature and 632 encryption" Protection Level, which SHOULD be used as default on the 633 sending side. 635 Certain implementations may decide to send "signature only" Messages, 636 depending on the circumstances and customer requirements. Sending 637 sides MAY and receiving sides MUST implement "signature only" 638 Protection Level. 640 It generally is NOT RECOMMENDED to send a Message with any other 641 Protection Level. On the other hand, the receiving side must be 642 prepared to receive Messages with other Protection Levels. 644 [[ TODO: Further study is necessary to determine whether - and if yes 645 to what extent - additional guidance for handling messages with other 646 Protection Levels, e.g. "encryption only" at the receiving side 647 should be included in this document. ]] 649 4.1. Main Use Case 651 This section applies to the main use case, where the sending and 652 receiving side (fully) support Header Protection as specified herein 653 (cf. Section 3.1.1). 655 Note: The sending side specification of the main use case is also 656 applicable to the cases where the sending side (fully) supports 657 Header Protection as specified herein, while the receiving side does 658 not, but is MIME-conformant according to [RFC2045], ff. (cf. 659 Section 3.1.2 and Section 3.1.2.1). 661 Further backward compatibility cases are defined in Section 4.2. 663 4.1.1. MIME Format 665 4.1.1.1. Introduction 667 As per S/MIME version 3.1 and later (cf. [RFC8551]), the sending 668 client MAY wrap a full MIME message in a message/RFC822 wrapper in 669 order to apply S/MIME security services to these header fields. 671 To help the receiving side to distinguish between a forwarded and a 672 wrapped message, the Content-Type header field parameter "forwarded" 673 is added as defined in [I-D.melnikov-iana-reg-forwarded]. 675 The simplified (cryptographic overhead not shown) MIME structure of 676 such an Email Message looks as follows: 678 680 682 684 686 688 The following example demonstrates how an Original Message might be 689 protected, i.e., the Original Message is contained as Inner Message 690 in the Protected Body of an Outer Message. It illustrates the first 691 Body part (of the Outer Message) as a "multipart/signed" 692 (application/pkcs7-signature) media type: 694 Lines are prepended as follows: 696 * "O: " Outer Message Header Section 698 * "I: " Message Header Section 700 * "W: " Wrapper (MIME Header Section) 701 O: Date: Mon, 25 Sep 2017 17:31:42 +0100 (GMT Daylight Time) 702 O: Message-ID: 703 O: Subject: Meeting at my place 704 O: From: "Alexey Melnikov" 705 O: To: somebody@example.net 706 O: MIME-Version: 1.0 707 O: Content-Type: multipart/signed; charset=us-ascii; micalg=sha1; 708 O: protocol="application/pkcs7-signature"; 709 O: boundary=boundary-AM 711 This is a multipart message in MIME format. 712 --boundary-AM 713 W: Content-Type: message/RFC822; forwarded=no 714 W: 715 I: Date: Mon, 25 Sep 2017 17:31:42 +0100 (GMT Daylight Time) 716 I: From: "Alexey Melnikov" 717 I: Message-ID: 718 I: MIME-Version: 1.0 719 I: MMHS-Primary-Precedence: 3 720 I: Subject: Meeting at my place 721 I: To: somebody@example.net 722 I: X-Mailer: Isode Harrier Web Server 723 I: Content-Type: text/plain; charset=us-ascii 725 This is an important message that I don't want to be modified. 727 --boundary-AM 728 Content-Transfer-Encoding: base64 729 Content-Type: application/pkcs7-signature 731 [[base-64 encoded signature]] 733 --boundary-AM-- 735 The Outer Message Header Section is unprotected, while the remainder 736 (Outer Message Body) is protected. The Outer Message Body consists 737 of the wrapper (MIME Header Section) and the Inner Message (Header 738 Section and Body). 740 The wrapper is a simple MIME Header Section with media type "message/ 741 rfc822" containing a Content-Type header field parameter 742 "forwarded=no" followed by an empty line. 744 If the source is an Original (message/rfc822) Message, the Inner 745 Message Header Section is typically the same as (or a subset of) the 746 Original Message Header Section, and the Inner Message Body is 747 typically the same as the Original Message Body. 749 The Inner Message itself may contain any MIME structure. 751 Note: It is still to be decided by the LAMPS WG whether or not to 752 recommend an alternative MIME format as described in Appendix C.1.1.1 753 (instead of the currently standardized and above defined format). 755 4.1.2. Sending Side 757 This section describes the process an MUA should use to apply 758 cryptographic protection to an e-mail message with header protection. 759 We start by describing the legacy message composition process as a 760 baseline. 762 4.1.2.1. Composing a Cryptographically-Protected Message Without Header 763 Protection 765 [I-D.dkg-lamps-e2e-mail-guidance] describes the typical process for a 766 legacy crypto MUA to apply cryptographic protections to an e-mail 767 message. That guidance and terminology is replicated here for 768 reference: 770 * "origbody": the traditional unprotected message body as a well- 771 formed MIME tree (possibly just a single MIME leaf part). As a 772 well-formed MIME tree, "origbody" already has structural headers 773 ("Content-*") present. 775 * "origheaders": the intended non-structural headers for the 776 message, represented here as a list of "(h,v)" pairs, where "h" is 777 a header field name and "v" is the associated value. Note that 778 these are header fields that the MUA intends to be visible to the 779 recipient of the message. In particular, if the MUA uses the 780 "Bcc" header during composition, but plans to omit it from the 781 message (see section 3.6.3 of [RFC5322]), it will not be in 782 "origheaders". 784 * "crypto": The series of cryptographic protections to apply (for 785 example, "sign with the secret key corresponding to X.509 786 certificate X, then encrypt to X.509 certificates X and Y"). This 787 is a routine that accepts a MIME tree as input (the Cryptographic 788 Payload), wraps the input in the appropriate Cryptographic 789 Envelope, and returns the resultant MIME tree as output. 791 The algorithm returns a MIME object that is ready to be injected into 792 the mail system: 794 * Apply "crypto" to "origbody", yielding MIME tree "output" 796 * For each header name and value "(h,v)" in "origheaders": 798 - Add header "h" of "output" with value "v" 800 * Return "output" 802 4.1.2.2. Header Confidentiality Policy 804 When composing an encrypted message with protected headers, the 805 composing MUA needs a Header Confidentialiy Policy. In this 806 document, we represent that Header Confidentiality Policy as a 807 function "hcp": 809 * "hcp(name, val_in) --> val_out": this function takes a header 810 field name "name" and initial value "val_in" as arguments, and 811 returns a replacement header value "val_out". If "val_out" is the 812 special value "null", it mean that the header in question should 813 be omitted from the set of headers visible outside the 814 Cryptographic Envelope. 816 For example, an MUA that only obscures the "Subject" header field by 817 replacing it with the literal string "[...]" and does not offer 818 confidentiality to any other header fields would be represented as 819 (in pseudocode): 821 "hcp(name, val_in) --> val_out: if name is 'Subject': return '[...]' 822 else: return val_in" 824 Note that such a policy is only needed when the end-to-end 825 protections include encryption (confidentiality). No comparable 826 policy is needed for other end-to-end cryptographic protections 827 (integrity and authenticity), as they are simply uniformly applied so 828 that all header fields known by the sender have these protections. 830 This asymmetry is an unfortunate consequence of complexities in 831 message delivery systems, some of which may reject, drop, or delay 832 messages where all headers are removed from the top-level MIME 833 object. 835 This document does not mandate any particular Header Confidentiality 836 Policy, though it offers guidance for MUA implementers in selecting 837 one in Section 4.1.3. Future documents may recommend or mandate such 838 a policy for an MUA with specific needs. Such a recommendation might 839 be motivated by descriptions of metadata-derived attacks, or stem 840 from research about message deliverability, or describe new 841 signalling mechanisms, but these topics are out of scope for this 842 document. 844 4.1.2.3. Composing with "Wrapped Message" Header Protection 846 To compose a message using "Wrapped Message" header protection, we 847 use those inputs described in Section 4.1.2.1 plus the Header 848 Confidentiality Policy "hcp" defined in Section 4.1.2.2. The new 849 algorithm is: 851 * For header name and value "(h,v)" in "origheaders": 853 - Add header "h" of "origbody" with value "v" 855 * If any of the header fields in "origbody", including headers in 856 the nested internal MIME structure, contain any 8-bit UTF-8 857 characters (see section section 3.7 of [RFC6532]): 859 - Let "payload" be a new MIME part with one header: "Content- 860 Type: message/global; forwarded=no", and whose body is 861 "origbody". 863 * Else: 865 - Let "payload" be a new MIME part with one header: "Content- 866 Type: message/rfc822; forwarded=no", and whose body is 867 "origbody". 869 * Apply "crypto" to "payload", yielding MIME tree "output" 871 * If "crypto" contains encryption: 873 - Create new empty list of header field names and values "newh" 875 - For header name and value "(h,v)" in "origheaders": 877 o Let "newval" be "hcp(h, v)" 879 o If "newval" is not "null": 881 + Append "(h,newval)" to "newh" 883 - Set "origheaders" to "newh" 885 * For header name and value "(h,v)" in "origheaders": 887 - Add header "h" of "output" with value "v" 889 * Return "output" 890 Note that the Header Confidentiality Policy "hcp" is ignored if 891 "crypto" does not contain encryption. This is by design. 893 4.1.2.4. Composing with "Injected Headers" Header Protection 895 To compose a message using "Injected Headers" header protection, the 896 composing MUA needs one additional input in addition to the Header 897 Confidentiality Policy "hcp" defined in Section 4.1.2.2. 899 * "legacy": a boolean value, indicating whether any recipient of the 900 message is believed to have a legacy client. If all recipients 901 are known to implement this draft, "legacy" should be set to 902 "false". (How a MUA determines the value of "legacy" is out of 903 scope for this document; an initial implementation can simply set 904 it to "true") 906 The revised algorithm for applying cryptographic protection to a 907 message is as follows: 909 * Create a new MIME leaf part "legacydisplay" with header "Content- 910 Type: text/plain; protected-headers="v1"" and an empty body. 912 * if "crypto" contains encryption, and "legacy" is "true": 914 - For each header name and value "(h,v)" in "origheaders": 916 o If "h" is user-facing (see 917 [I-D.autocrypt-lamps-protected-headers]): 919 + If "hcp(h,v)" is not "v": 921 * Add "h: v" to the body of "legacydisplay". For 922 example, if "h" is "Subject", and "v" is "lunch 923 plans?", then add the line "Subject: lunch plans?" to 924 the body of "legacydisplay" 926 * If the body of "legacydisplay" is empty: 928 - Let "payload" be MIME part "origbody", discarding 929 "legacydisplay" 931 * Else: (body of "legacydisplay" is not empty) 933 - Construct a new MIME part "wrapper" with "Content-Type: 934 multipart/mixed" 936 - Give "wrapper" exactly two subparts: "legacydisplay" and 937 "origbody", in that order. 939 - Let "payload" be MIME part "wrapper" 941 * For each header name and value "(h,v)" in "origheaders": 943 - Add header "h" of MIME part "payload" with value "v" 945 * Set the "protected-headers" parameter on the "Content-Type" of 946 "payload" to "v1" 948 * Apply "crypto" to "payload", producing MIME tree "output" 950 * If "crypto" contains encryption: 952 - Create new empty list of header field names and values "newh" 954 - For header name and value "(h,v)" in "origheaders": 956 o Let "newval" be "hcp(h, v)" 958 o If "newval" is not "null": 960 + Add "newh[h]" to "newval" 962 - Set "origheaders" to "newh" 964 * For each header name and value "(h,v)" in "origheaders": 966 - Add header "h" of "output" with value "v" 968 * Return "output" 970 Note that both new parameters ("hcp" and "legacy") are effectively 971 ignored if "crypto" does not contain encryption. This is by design, 972 because they are irrelevant for signed-only cryptographic 973 protections. 975 4.1.2.5. Choosing Between Wrapped Message and Injected Headers 977 When composing a message with end-to-end cryptographic protections, 978 an MUA SHOULD protect the headers of that message as well as the 979 body. 981 An MUA MAY protect the headers of any outbound message using either 982 the "Wrapped Message" or the "Injected Headers" style of protection. 983 See Section 4.2 for more discussion about reasons to choose one 984 mechanism or another. 986 [[ TODO: this document should recommend generation of one particular 987 scheme by default for new implementers ]] 989 4.1.3. Default Header Confidentiality Policy 991 An MUA SHOULD have a sensible default Header Confidentiality Policy, 992 and SHOULD NOT require the user to select one. 994 The default Header Confidentiality Policy SHOULD provide 995 confidentiality for the "Subject" header field by replacing it with 996 the literal string "[...]". Most users treat the Subject of a 997 message the same way that they treat the body, and they are surprised 998 to find that the Subject of an encrypted message is visible. 1000 [[ TODO: select one of the two policies below the recommended default 1001 ]] 1003 4.1.3.1. Minimalist Header Confidentiality Policy 1005 Accordingly, the most conservative recommended Header Confidentiality 1006 Policy only protects the "Subject": 1008 "hcp_minimal(name, val_in) --> val_out: if name is 'Subject': return 1009 '[...]' else: return val_in" 1011 4.1.3.2. Strong Header Confidentiality Policy 1013 Alternately, a more aggressive (and therefore more privacy- 1014 preserving) Header Confidentiality Policy only leaks a handful of 1015 fields whose absence is known to increase rates of delivery failure, 1016 and simultaneously obscures the "Message-ID" behind a random new one: 1018 "hcp_strong(name, val_in) --> val_out: if name in ['From', 'To', 1019 'Cc', 'Date']: return val_in else if name is 'Subject': return 1020 '[...]' else if name is 'Message-ID': return 1021 generate_new_message_id() else: return null" 1023 The function "generate_new_message_id()" represents whatever process 1024 the MUA typically uses to generate a "Message-ID" for a new outbound 1025 message. 1027 4.1.3.3. Offering Stronger Header Confidentiality 1029 A MUA MAY offer even stronger confidentiality for headers of an 1030 encrypted message than described in Section 4.1.3.2. For example, it 1031 might implement an HCP that obfuscates the "From" field, or omits the 1032 "Cc" field, or ensures "Date" is represented in "UTC" (obscuring the 1033 local timezone). 1035 The authors of this document hope that implementers with deployment 1036 experience will document their chosen Header Confidentiality Policy 1037 and the rationale behind their choice. 1039 4.1.4. Receiving Side 1041 An MUA that receives a cryptographically-protected e-mail will render 1042 it for the user. 1044 The receiving MUA will render the message body, a selected subset of 1045 header fields, and (as described in 1046 [I-D.dkg-lamps-e2e-mail-guidance]) provide a summary of the 1047 cryptographic properties of the message. 1049 Most MUAs only render a subset of header fields by default. For 1050 example, few MUAs typically render "Message-Id" or "Received" header 1051 fields for the user, but most do render "From", "To", "Cc", "Date", 1052 and "Subject". 1054 A MUA that knows how to handle a message with protected headers makes 1055 the following two changes to its behavior when rendering a message: 1057 * If it detects that an incoming message had protected headers, it 1058 renders header fields for the message from the protected headers, 1059 ignoring the external (unprotected) headers. 1061 * It includes information in the message's cryptographic summary to 1062 indicate the types of protection that applied to each rendered 1063 header field (if any). 1065 A MUA that handles protected headers does _not_ need to render any 1066 new header fields that it did not render before. 1068 4.1.4.1. Identifying that a Message has Protected Headers 1070 An incoming message can be identified as having protected headers 1071 based on one of two signals: 1073 * The Cryptographic Payload has "Content-Type: message/rfc822" or 1074 "Content-Type: message/global" and the parameter "forwarded" has a 1075 value of "no". See Section 4.1.4.3 for rendering guidance. 1077 * The Cryptographic Payload has some other "Content-Type" and it has 1078 parameter "protected-headers" set to "v1". See Section 4.1.4.4 1079 for rendering guidance. 1081 Messages of both types exist in the wild, and a sensible MUA should 1082 be able to handle them both. They provide the same semantics and the 1083 same meaning. 1085 4.1.4.2. Updating the Cryptographic Summary 1087 Regardless of whether a cryptographically-protected message has 1088 protected headers, the cryptographic summary of the message should be 1089 modified to indicate what protections the headers have. 1091 Each header individually has exactly one the following protections: 1093 * "unprotected" (this is the case for all headers in messages that 1094 have no protected headers) 1096 * "signed-only" (bound into the same validated signature as the 1097 enclosing message, but also visible in transit) 1099 * "encrypted-only" (only appears within the cryptographic payload; 1100 the corresponding external header was either omitted or 1101 obfuscated) 1103 * "encrypted-and-signed" (same as encrypted, but additionally is 1104 under a validatd signature) 1106 Note that while the message itself may be "encrypted-and-signed", 1107 some headers may be replicated on the outside of the message (e.g. 1108 "Date") Those headers would be "signed-only", despite the message 1109 itself being "encrypted-and-signed". 1111 Rendering this information is likely to be complex and messy --- 1112 users may not understand it. It is beyond the scope of this document 1113 to suggest any specific graphical affordances or user experience. 1114 Future work should include examples of successful rendering of this 1115 information. 1117 4.1.4.3. Rendering a Wrapped Message 1119 When the Cryptographic Payload has "Content-Type" of "message/rfc822" 1120 or "message/global", and the parameter "forwarded" is set to "no", 1121 the values of the protected headers are drawn from the headers of the 1122 Cryptographic Payload, and the body that is rendered is the body of 1123 the Cryptographic Payload. 1125 4.1.4.3.1. Example Signed-Only Wrapped Message 1127 Consider a message with this structure, where the MUA is able to 1128 validate the cryptographic signature: 1130 A └─╴application/pkcs7-mime; smime-type="signed-data" 1131 ⇩ (unwraps to) 1132 B └┬╴message/rfc822 [Cryptographic Payload] 1133 C └┬╴multipart/alternative [Rendered Body] 1134 D ├─╴text/plain 1135 E └─╴text/html 1137 The message body should be rendered the same way as this message: 1139 C └┬╴multipart/alternative 1140 D ├─╴text/plain 1141 E └─╴text/html 1143 It should render header fields taken from part "C". 1145 Its cryptographic summary should indicates that the message was 1146 signed and all rendered header fields were included in the signature. 1148 The MUA SHOULD ignore header fields from part "A" for the purposes of 1149 rendering. 1151 4.1.4.3.2. Example Encrypted-and-Signed Wrapped Message 1153 Consider a message with this structure, where the MUA is able to 1154 validate the cryptographic signature: 1156 F └─╴application/pkcs7-mime; smime-type="enveloped-data" 1157 ↧ (decrypts to) 1158 G └─╴application/pkcs7-mime; smime-type="signed-data" 1159 ⇩ (unwraps to) 1160 H └┬╴message/rfc822 [Cryptographic Payload] 1161 I └┬╴multipart/alternative [Rendered Body] 1162 J ├─╴text/plain 1163 K └─╴text/html 1165 The message body should be rendered the same way as this message: 1167 I └┬╴multipart/alternative 1168 J ├─╴text/plain 1169 K └─╴text/html 1171 It should render headers taken from part "I". 1173 Its cryptographic summary should indicates that the message was 1174 signed and encrypted. Each rendered header field found in "I" should 1175 be compared against the header field of the same name from "F". If 1176 the value found in "F" matches the value found in "I", the header 1177 field should be marked as "signed-only". If no matching header field 1178 was found in "F", or the value found did not match the value from 1179 "I", the header field should be marked as "signed-and-encrypted". 1181 4.1.4.4. Rendering a Message with Injected Headers 1183 When the Cryptographic Payload does not have a "Content-Type" of 1184 "message/rfc822" or "message/global", and the parameter "protected- 1185 headers" is set to "v1", the values of the protected headers are 1186 drawn from the headers of the Cryptographic Payload, and the body 1187 that is rendered is the Cryptographic Payload itself. 1189 4.1.4.4.1. Example Signed-only Message with Injected Headers 1191 L └─╴application/pkcs7-mime; smime-type="signed-data" 1192 ⇩ (unwraps to) 1193 M └┬╴multipart/alternative [Cryptographic Payload + Rendered Body] 1194 N ├─╴text/plain 1195 O └─╴text/html 1197 The message body should be rendered the same way as this message: 1199 M └┬╴multipart/alternative 1200 N ├─╴text/plain 1201 O └─╴text/html 1203 It should render header fieldss taken from part "M". 1205 Its cryptographic summary should indicates that the message was 1206 signed and all rendered header fields were included in the signature. 1208 The MUA SHOULD ignore header fields from part "L" for the purposes of 1209 rendering. 1211 4.1.4.4.2. Example Signed-and-Encrypted Message with Injected Headers 1213 Consider a message with this structure, where the MUA is able to 1214 validate the cryptographic signature: 1216 P └─╴application/pkcs7-mime; smime-type="enveloped-data" 1217 ↧ (decrypts to) 1218 Q └─╴application/pkcs7-mime; smime-type="signed-data" 1219 ⇩ (unwraps to) 1220 R └┬╴multipart/alternative [Cryptographic Payload + Rendered Body] 1221 S ├─╴text/plain 1222 T └─╴text/html 1224 The message body should be rendered the same way as this message: 1226 R └┬╴multipart/alternative 1227 S ├─╴text/plain 1228 T └─╴text/html 1230 It should render headers taken from part "R". 1232 Its cryptographic summary should indicates that the message was 1233 signed and encrypted. As in Section 4.1.4.3.2, each rendered header 1234 field found in "R" should be compared against the header field of the 1235 same name from "P". If the value found in "P" matches the value 1236 found in "R", the header field should be marked as "signed-only". If 1237 no matching header field was found in "P", or the value found did not 1238 match the value from "R", the header field should be marked as 1239 "signed-and-encrypted". 1241 4.1.4.4.3. Do Not Render Legacy Display Part 1243 As described [I-D.autocrypt-lamps-protected-headers], a message with 1244 cryptographic confidentiality protection MAY include a "Legacy 1245 Display" part for backward-compatibility with legacy MUAs 1247 The receiving MUA SHOULD avoid rendering the Legacy Display part to 1248 the user at all, since it is aware of and can render the actual 1249 Protected Headers. 1251 If a Legacy Display part is detected, it and its enclosing 1252 "multipart/mixed" wrapper should be discarded before rendering. 1254 4.1.4.4.3.1. Legacy Display Detection Algorithm 1256 A receiving MUA acting on a message SHOULD detect the presence of a 1257 Legacy Display part and the corresponding "original body" with the 1258 following simple algorithm: 1260 * Check that all of the following are true for the message: 1262 * The Cryptographic Envelope must contain an encrypting 1263 Cryptographic Layer 1265 * The Cryptographic Payload must have a "Content-Type" of 1266 "multipart/mixed" 1268 * The Cryptographic Payload must have exactly two subparts 1270 * The first subpart of the Cryptographic Payload must have a 1271 "Content-Type" of "text/plain" or "text/rfc822-headers" 1273 * The first subpart of the Cryptographic Payload's "Content-Type" 1274 must contain a property of "protected-headers", and its value must 1275 be "v1". 1277 * If all of the above are true, then the first subpart is the Legacy 1278 Display part, and the second subpart is the "original body". 1279 Otherwise, the message does not have a Legacy Display part. 1281 4.1.4.4.3.2. Legacy Display Example 1283 Consider a message with this structure, where the MUA is able to 1284 validate the cryptographic signature: 1286 U └─╴application/pkcs7-mime; smime-type="enveloped-data" 1287 ↧ (decrypts to) 1288 V └─╴application/pkcs7-mime; smime-type="signed-data" 1289 ⇩ (unwraps to) 1290 W └┬╴multipart/mixed [Cryptographic Payload] 1291 X ├─╴text/plain [Legacy Display] 1292 Y └┬╴multipart/alternative [Rendered Body] 1293 Z ├─╴text/plain 1294 A' └─╴text/html 1296 The message body should be rendered the same way as this message, 1297 effectively hiding the Legacy Display part ("X") and its wrapper: 1299 Y └┬╴multipart/alternative 1300 Z ├─╴text/plain 1301 A' └─╴text/html 1303 It should render headers taken from part "W", following the same 1304 guidance as in Section 4.1.4.4.2 and Section 4.1.4.3.2 about the 1305 cryptographic status of each rendered header field. 1307 4.1.4.5. Affordances for Debugging and Troubleshooting 1309 Note that advanced users of an MUA may need access to the original 1310 message, for example to troubleshoot problems with the MUA itself, or 1311 problems with the SMTP transport path taken by the message. 1313 A MUA that applies these rendering guidelines SHOULD ensure that the 1314 full original source of the message as it was received remains 1315 available to such a user for debugging and troubleshooting. 1317 4.1.4.6. Composing a Reply to an Encrypted Message with Protected 1318 Headers 1320 When composing a reply to an encrypted message with protected 1321 headers, the MUA is acting both as a receiving MUA and as a sending 1322 MUA. Special guidance applies here, as things can go wrong in at 1323 least two ways: leaking previously-confidential information, and 1324 replying to the wrong party. 1326 4.1.4.6.1. Avoid Leaking Encrypted Headers in Reply 1328 As noted in [I-D.dkg-lamps-e2e-mail-guidance], an MUA in this 1329 position MUST NOT leak previously-encrypted content in the clear in a 1330 followup message. The same is true for protected headers. 1332 Values from any header field that was identified as either 1333 "encrypted" or "signed-and-encrypted" based on the steps outlined 1334 above MUST NOT be placed in cleartext output when generating a 1335 message. 1337 In particular, if "Subject" was encrypted, and it is copied into the 1338 draft encrypted reply, the replying MUA MUST obfuscate the "Subject" 1339 field in the cleartext header as described above. 1341 [[ TODO: formally describe how a replying MUA should generate a 1342 message-specific Header Protection policy based on the cryptographic 1343 status of the headers of the incoming message ]] 1345 4.1.4.6.2. Avoid Misdirected Replies to Encrypted Messages with 1346 Protected Headers 1348 When replying to a message, the Composing MUA typically decides who 1349 to send the reply to based on: 1351 * the "Reply-To", "Mail-Followup-To", or "From" headers 1353 * optionally, the other "To" or "Cc" headers (if the user chose to 1354 "reply all") 1356 When a message has protected headers, the replying MUA MUST populate 1357 the destination fields of the draft message using the protected 1358 headers, and ignore any unprotected headers. 1360 This mitigates against an attack where Mallory gets a copy of an 1361 encrypted message from Alice to Bob, and then replays the message to 1362 Bob with an additional "Cc" to Mallory's own e-mail address in the 1363 message's outer header. 1365 If Bob knows Mallory's certificate already, and he replies to such a 1366 message without following the guidance in this section, it's likely 1367 that his MUA will encrypt the cleartext of the message directly to 1368 Mallory. 1370 4.1.4.7. Implicitly-rendered Header Fields 1372 While "From" and "To" and "Cc" and "Subject" and "Date" are often 1373 explicitly rendered to the user, some header fields do affect message 1374 display, without being explicitly rendered. 1376 For example, "Message-Id", "References", and "In-Reply-To" header 1377 fields may collectively be used to place a message in a "thread" or 1378 series of messages. 1380 In another example, Section 4.1.4.6.2 observes that the value of the 1381 "Reply-To" field can influence the draft reply message. So while the 1382 user may never see the "Reply-To" header directly, it is implicitly 1383 "rendered" when the user interacts with the message by replying to 1384 it. 1386 An MUA that depends on any implicitly-rendered header field in a 1387 message with protected headers SHOULD use the value from the 1388 protected header, and SHOULD NOT use any value found outside the 1389 cryptographic protection. 1391 4.1.4.8. Unprotected Headers Added in Transit 1393 Some headers are legitimately added in transit, and could not have 1394 been known to the sender at message composition time. 1396 The most common of these headers are "Received" and "DKIM-Signature", 1397 neither of which are typically rendered, either explicitly or 1398 implicitly. 1400 If a receiving MUA has specific knowledge about a given header field, 1401 including that: 1403 * the header field would not have been known to the original sender, 1404 and 1406 * the header field might be rendered explicitly or implicitly, 1407 then the MUA MAY decide to operate on the value of that header field 1408 from the unprotected header section, even though the message has 1409 protected headers. 1411 The MUA MAY prefer to verify that the headers in question have 1412 additional transit-derived cryptographic protections (e.g., to test 1413 whether they are covered by a valid "DKIM-Signature") before 1414 rendering or acting on them. 1416 Specific examples appear below. 1418 4.1.4.8.1. Mailing list headers: List-* and Archived-At 1420 If the message arrives through a mailing list, the list manager 1421 itself may inject headers (most of which start with "List-") in the 1422 message: 1424 * "List-Archive" 1426 * "List-Subscribe" 1428 * "List-Unsubscribe" 1430 * "List-Id" 1432 * "List-Help" 1434 * "List-Post" 1436 * "Archived-At" 1438 For some MUAs, these headers are implicitly rendered, by providing 1439 buttons for actions like "Subscribe", "View Archived Version", "Reply 1440 List", "List Info", etc. 1442 An MUA that receives a message with protected headers that contains 1443 these header fields in the unprotected section, and that has reason 1444 to believe the message is coming through a mailing list MAY decide to 1445 render them to the user (explicitly or implicitly) even though they 1446 are not protected. 1448 FIXME: other examples of unprotected transit headers? 1450 4.2. Backward Compatibility Use Cases 1451 4.2.1. Receiving Side MIME-Conformant 1453 This section applies to the case where the sending side (fully) 1454 supports Header Protection as specified in this document, while the 1455 receiving side does not support this specification, but is MIME- 1456 conformant according to [RFC2045], ff. (cf. Section 3.1.2 and 1457 Section 3.1.2.1) 1459 The sending side specification of the main use case (cf. 1460 Section 4.1) MUST ensure that receiving sides can still recognize and 1461 display or offer to display the encapsulated data in accordance with 1462 its media type (cf. [RFC2049], Section 2). In particular, receiving 1463 sides that do not support this specification, but are MIME-conformant 1464 according to [RFC2045], ff. can still recognize and display the 1465 Message intended for the user. 1467 [[ TODO: Verify once solution is stable and update last sentence. ]] 1469 4.2.2. Receiving Side Not MIME-Conformant 1471 This section applies to cases where the sending side (fully) supports 1472 Header Protection as specified in this document, while the receiving 1473 side neither supports this specification *nor* is MIME-conformant 1474 according to [RFC2045], ff. (cf. Section 3.1.2 and Section 3.1.2.2). 1476 [I-D.autocrypt-lamps-protected-headers] describes a possible way to 1477 achieve backward compatibility with existing S/MIME (and PGP/MIME) 1478 implementations that predate this specification and are not MIME- 1479 conformant (Legacy Display) either. It mainly focuses on email 1480 clients that do not render emails which utilize header protection in 1481 a user friendly manner, which may confuse the user. While this has 1482 been observed occasionally in PGP/MIME (cf. [RFC3156]), the extent 1483 of this problem with S/MIME implementations is still unclear. (Note: 1484 At this time, none of the samples in 1485 [I-D.autocrypt-lamps-protected-headers] apply header protection as 1486 specified in Section 3.1 of [RFC8551], which is wrapping as Media 1487 Type "message/RFC822".) 1489 Should serious backward compatibility issues with rendering at the 1490 receiving side be discovered, the Legacy Display format described in 1491 [I-D.autocrypt-lamps-protected-headers] may serve as a basis to 1492 mitigate those issues (cf. Section 4.2). 1494 Another variant of backward compatibility has been implemented by pEp 1495 [I-D.pep-email], i.e. pEp Email Format 1.0. At this time pEp has 1496 implemented this for PGP/MIME, but not yet S/MIME. 1498 5. Usability Considerations 1500 This section describes concerns for MUAs that are interested in easy 1501 adoption of header protection by normal users. 1503 While they are not protocol-level artifacts, these concerns motivate 1504 the protocol features described in this document. 1506 See also the Usability section in [I-D.dkg-lamps-e2e-mail-guidance]. 1508 5.1. Mixed Protections Within a Message Are Hard To Understand 1510 [[ TODO ]] 1512 5.2. Users Should Not Have To Choose a Header Confidentiality Policy 1514 [[ TODO ]] 1516 6. Security Considerations 1518 [[ TODO ]] 1520 7. Privacy Considerations 1522 [[ TODO ]] 1524 8. IANA Considerations 1526 This document requests no action from IANA. 1528 [[ RFC Editor: This section may be removed before publication. ]] 1530 9. Acknowledgments 1532 The authors would like to thank the following people who have 1533 provided helpful comments and suggestions for this document: Berna 1534 Alp, Bernhard E. Reiter, Claudio Luck, David Wilson, Hernani 1535 Marques, juga, Krista Bennett, Kelly Bristol, Lars Rohwedder, Robert 1536 Williams, Russ Housley, Sofia Balicka, Steve Kille, Volker Birk, and 1537 Wei Chuang. 1539 10. References 1541 10.1. Normative References 1543 [I-D.dkg-lamps-e2e-mail-guidance] 1544 Gillmor, D. K., "Guidance on End-to-End E-mail Security", 1545 Work in Progress, Internet-Draft, draft-dkg-lamps-e2e- 1546 mail-guidance-01, 22 February 2021, 1547 . 1550 [I-D.ietf-lamps-header-protection-requirements] 1551 Melnikov, A. and B. Hoeneisen, "Problem Statement and 1552 Requirements for Header Protection", Work in Progress, 1553 Internet-Draft, draft-ietf-lamps-header-protection- 1554 requirements-01, 29 October 2019, 1555 . 1558 [RFC2045] Freed, N. and N. Borenstein, "Multipurpose Internet Mail 1559 Extensions (MIME) Part One: Format of Internet Message 1560 Bodies", RFC 2045, DOI 10.17487/RFC2045, November 1996, 1561 . 1563 [RFC2046] Freed, N. and N. Borenstein, "Multipurpose Internet Mail 1564 Extensions (MIME) Part Two: Media Types", RFC 2046, 1565 DOI 10.17487/RFC2046, November 1996, 1566 . 1568 [RFC2049] Freed, N. and N. Borenstein, "Multipurpose Internet Mail 1569 Extensions (MIME) Part Five: Conformance Criteria and 1570 Examples", RFC 2049, DOI 10.17487/RFC2049, November 1996, 1571 . 1573 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 1574 Requirement Levels", BCP 14, RFC 2119, 1575 DOI 10.17487/RFC2119, March 1997, 1576 . 1578 [RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322, 1579 DOI 10.17487/RFC5322, October 2008, 1580 . 1582 [RFC8551] Schaad, J., Ramsdell, B., and S. Turner, "Secure/ 1583 Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 1584 Message Specification", RFC 8551, DOI 10.17487/RFC8551, 1585 April 2019, . 1587 10.2. Informative References 1589 [I-D.autocrypt-lamps-protected-headers] 1590 Einarsson, B. R., juga, and D. K. Gillmor, "Protected 1591 Headers for Cryptographic E-mail", Work in Progress, 1592 Internet-Draft, draft-autocrypt-lamps-protected-headers- 1593 02, 20 December 2019, . 1596 [I-D.ietf-lamps-samples] 1597 Gillmor, D. K., "S/MIME Example Keys and Certificates", 1598 Work in Progress, Internet-Draft, draft-ietf-lamps- 1599 samples-04, 18 May 2021, . 1602 [I-D.melnikov-iana-reg-forwarded] 1603 Melnikov, A. and B. Hoeneisen, "IANA Registration of 1604 Content-Type Header Field Parameter 'forwarded'", Work in 1605 Progress, Internet-Draft, draft-melnikov-iana-reg- 1606 forwarded-00, 4 November 2019, 1607 . 1610 [I-D.pep-email] 1611 Marques, H., "pretty Easy privacy (pEp): Email Formats and 1612 Protocols", Work in Progress, Internet-Draft, draft-pep- 1613 email-01, 2 November 2020, 1614 . 1616 [pEp.mixnet] 1617 pEp Foundation, "Mixnet", June 2020, 1618 . 1620 [RFC3156] Elkins, M., Del Torto, D., Levien, R., and T. Roessler, 1621 "MIME Security with OpenPGP", RFC 3156, 1622 DOI 10.17487/RFC3156, August 2001, 1623 . 1625 [RFC4949] Shirey, R., "Internet Security Glossary, Version 2", 1626 FYI 36, RFC 4949, DOI 10.17487/RFC4949, August 2007, 1627 . 1629 [RFC6376] Crocker, D., Ed., Hansen, T., Ed., and M. Kucherawy, Ed., 1630 "DomainKeys Identified Mail (DKIM) Signatures", STD 76, 1631 RFC 6376, DOI 10.17487/RFC6376, September 2011, 1632 . 1634 [RFC6409] Gellens, R. and J. Klensin, "Message Submission for Mail", 1635 STD 72, RFC 6409, DOI 10.17487/RFC6409, November 2011, 1636 . 1638 [RFC6532] Yang, A., Steele, S., and N. Freed, "Internationalized 1639 Email Headers", RFC 6532, DOI 10.17487/RFC6532, February 1640 2012, . 1642 [RFC7489] Kucherawy, M., Ed. and E. Zwicky, Ed., "Domain-based 1643 Message Authentication, Reporting, and Conformance 1644 (DMARC)", RFC 7489, DOI 10.17487/RFC7489, March 2015, 1645 . 1647 Appendix A. Test Vectors 1649 This section contains sample messages using the different schemes 1650 described in this document. Each sample contains a MIME object, a 1651 textual and diagrammatic view of its structure, and examples of how 1652 an MUA might render it. 1654 The cryptographic protections used in this document use the S/MIME 1655 standard, and keying material and certificates come from 1656 [I-D.ietf-lamps-samples]. 1658 These messages should be accessible to any IMAP client at 1659 "imap://bob@header-protection.cmrg.net/" (any password should 1660 authenticate to this read-only IMAP mailbox). 1662 You can also download copies of these test vectors separately at 1663 "https://header-protection.cmrg.net". 1665 If any of the messages downloaded differ from those offered here, 1666 this document is the canonical source. 1668 A.1. Baseline Messages 1670 These messages offer no header protection at all, and can be used as 1671 a baseline. They are provided in this document as a counterexample. 1672 An MUA implementer can use these messages to verify that the reported 1673 cryptographic summary of the message indicates no header protection. 1675 A.1.1. No cryptographic protections over a simple message 1677 This message uses no cryptographic protection at all. Its body is a 1678 text/plain message. 1680 It has the following structure: 1682 └─╴text/plain 152 bytes 1684 Its contents are: 1686 MIME-Version: 1.0 1687 Content-Type: text/plain; charset="utf-8" 1688 Content-Transfer-Encoding: 7bit 1689 Subject: no-crypto 1690 Message-ID: 1691 From: Alice 1692 To: Bob 1693 Date: Sat, 20 Feb 2021 10:00:02 -0500 1695 This is the no-crypto message. 1697 This message uses no cryptographic protection at all. Its body is a 1698 text/plain message. 1700 -- 1701 Alice 1702 alice@smime.example 1704 A.1.2. S/MIME signed-only signedData over a simple message, No Header 1705 Protection 1707 This is a signed-only S/MIME message via PKCS#7 signedData. The 1708 payload is a text/plain message. It uses no header protection. 1710 It has the following structure: 1712 └─╴application/pkcs7-mime [smime.p7m] 3852 bytes 1713 ⇩ (unwraps to) 1714 └─╴text/plain 204 bytes 1716 Its contents are: 1718 Content-Transfer-Encoding: base64 1719 Content-Type: application/pkcs7-mime; name="smime.p7m"; 1720 smime-type="signed-data" 1721 Subject: smime-one-part 1722 Message-ID: 1723 From: Alice 1724 To: Bob 1725 Date: Sat, 20 Feb 2021 10:01:02 -0500 1727 MIILFwYJKoZIhvcNAQcCoIILCDCCCwQCAQExDTALBglghkgBZQMEAgEwggFABgkq 1728 hkiG9w0BBwGgggExBIIBLU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 1729 IHRleHQvcGxhaW47IGNoYXJzZXQ9InV0Zi04Ig0KQ29udGVudC1UcmFuc2Zlci1F 1730 bmNvZGluZzogN2JpdA0KDQpUaGlzIGlzIHRoZSBzbWltZS1vbmUtcGFydCBtZXNz 1731 YWdlLg0KDQpUaGlzIGlzIGEgc2lnbmVkLW9ubHkgUy9NSU1FIG1lc3NhZ2Ugdmlh 1732 IFBLQ1MjNyBzaWduZWREYXRhLiAgVGhlDQpwYXlsb2FkIGlzIGEgdGV4dC9wbGFp 1733 biBtZXNzYWdlLiBJdCB1c2VzIG5vIGhlYWRlciBwcm90ZWN0aW9uLg0KDQotLSAN 1734 CkFsaWNlDQphbGljZUBzbWltZS5leGFtcGxlDQqgggemMIIDzzCCAregAwIBAgIT 1735 Dy0lvRE5l0rOQlSHoe49NAaKtDANBgkqhkiG9w0BAQ0FADBVMQ0wCwYDVQQKEwRJ 1736 RVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJT 1737 QSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAgFw0xOTExMjAwNjU0MThaGA8yMDUy 1738 MDkyNzA2NTQxOFowOzENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx 1739 FzAVBgNVBAMTDkFsaWNlIExvdmVsYWNlMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A 1740 MIIBCgKCAQEAmpUp+ovBouOP6AFQJ+RpwpODxxzY60n1lJ53pTeNSiJlWkwtw/cx 1741 Qq0t4uD2vWYB8gOUH/CVt2Zp1c+auzPKJ2Zu5mY6kHm+hVB+IthjLeI7Htg6rNeu 1742 Xq50/TuTSxX5R1I1EXGt8p6hAQVeA5oZ2afHg4b97enV8gozR0/Nkug4AkXmbk7T 1743 HNc8vvjMUJanZ/VmS4TgDqXjWShplcI3lcvvBZMswt41/0HJvmSwqpS6oQcAx3We 1744 ag0yCNj1V9V9yu/3DjcYbwW2lJf5NbMHbM1LY4X5chWfNEbkN6hQury/zxnlsukg 1745 n+fHbqvwDhJLAgFpW/jA/EB/WI+whUpqtQIDAQABo4GvMIGsMAwGA1UdEwEB/wQC 1746 MAAwFwYDVR0gBBAwDjAMBgpghkgBZQMCATABMB4GA1UdEQQXMBWBE2FsaWNlQHNt 1747 aW1lLmV4YW1wbGUwEwYDVR0lBAwwCgYIKwYBBQUHAwQwDgYDVR0PAQH/BAQDAgUg 1748 MB0GA1UdDgQWBBSiU0HVRDyAKRV8ASPw546vzfN3DzAfBgNVHSMEGDAWgBSRMI58 1749 BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG9w0BAQ0FAAOCAQEAgUl4oJyxMpwWpAyl 1750 OvK6NEbMl1gD5H14EC4Muxq1u0q2XgXOSBHI6DfX/4LDsfx7fSIus8gWVY3WqMeu 1751 OA7IizkBD+GDEu8uKveERRXZncxGwy2MfbH1Ib3U8QzTjqB8+dz2AwYeMxODWq9o 1752 pwtA/lTOkRg8uuivZfg/m5fFo/QshlHNaaTDVEXsU4Ps98Hm/3gznbvhdjFbZbi4 1753 oZ3tAadRlE5K9JiQaJYOnUmGpfB8PPwDR6chMZeegSQAW++OIKqHrg/WEh4yiuPf 1754 qmAvX2hZkPpivNJYdTPUXTSO7K459CyqbqG+sNOo2kc1nTXl85RHNrVKQK+L0YWY 1755 1Q+hWDCCA88wggK3oAMCAQICEzdBBXntdX9CqaJcOvT4as6aqdcwDQYJKoZIhvcN 1756 AQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNV 1757 BAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwIBcN 1758 MTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoTBElFVEYx 1759 ETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFjZTCCASIw 1760 DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALT0iehYOBY+TZp/T5K2KNI05Hwr 1761 +E3wP6XTvyi6WWyTgBK9LCOwI2juwdRrjFBSXkk7pWpjXwsA3A5GOtz0FpfgyC7O 1762 xsVcF7q4WHWZWleYXFKlQHJD73nQwXP968+A/3rBX7PhO0DBbZnfitOLPgPEwjTt 1763 dg0VQQ6Wz+CRQ/YbHPKaw7aRphZO63dKvIKp4cQVtkWQHi6syTjGsgkLcLNau5LZ 1764 DQUdsGV+SAo3nBdWCRYV+I65x8Kf4hCxqqmjV3d/2NKRu0BXnDe/N+iDz3X0zEoj 1765 0fqXgq4SWcC0nsG1lyyXt1TL270I6ATKRGJWiQVCCpDtc0NT6vdJ45bCSzsCAwEA 1766 AaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUDAgEwATAe 1767 BgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoGCCsGAQUF 1768 BwMEMA4GA1UdDwEB/wQEAwIGwDAdBgNVHQ4EFgQUu/bMsi0dBhIcl64papAQ0yBm 1769 ZnMwHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZIhvcNAQEN 1770 BQADggEBAHOJojanzqmgaSN3/gqSQ4cbbmdj/R40BEPr+gXT+xiidfZ2iLNwYyTn 1771 euK6AChwKfnNvOFb8lV1iffRTF/KtmVEDMR/sYeqAH83KM5p3el2lVh4OHhyI0qN 1772 uz5oShNaACSioQ23WxHGVy9vsdVfnbhsplrWg9NQ2WbpCmK+2oMh2oYl0Z/wvXMt 1773 9cG6jbMvcdH4z0IOvg6mrYkKTM/RCGnumghxwYToj1OyD5Gs4D2IJCw+fX5ODxh5 1774 2MbNRYXTus2ZPRPM8JXNQC4GWv4km3M4rKnJDd6hnoQ9rNeozIcBVyybQYjfrgg4 1775 DRvw9Ksk22OH4ConlB8f7R7s1LM2cSYxggIAMIIB/AIBATBsMFUxDTALBgNVBAoT 1776 BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMg 1777 UlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhM3QQV57XV/QqmiXDr0+GrOmqnX 1778 MAsGCWCGSAFlAwQCAaBpMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZI 1779 hvcNAQkFMQ8XDTIxMDIyMDE1MDEwMlowLwYJKoZIhvcNAQkEMSIEIESMi+9/LUlD 1780 fGjj+6U50VNLFxbzvyVJ0wzwnTS114DyMA0GCSqGSIb3DQEBAQUABIIBACJHeayB 1781 UllC4GdcgdojTUjoeIy6UIbrSg/aKZgAkCB8Dwq0hdU10qiun6WKI/TxM5izpRvL 1782 UsNBGmqknPBMFhvwX6KCrwFk0p0j5Y5DZqX30deiQiGTUv3NiwZGTrKJ3JkyymFO 1783 HGbe5Thrq3inRLVfilEuIZewaJsnJhKfnEq9fS09icTJ5olPDAH6mZbW6hpYmU3F 1784 KBk2qJNqJX6bo60rCogu3wXDj0wxnqEXmeNDH5/+L9UVZur+EWzviUc8Ldd/kP3L 1785 DOO7ivs10bAWe8Tbw7NjuP8ZlVvzcvj3nXWzZzxh2ymDIOvyJA+t0LHQvsN/fbdW 1786 fC6Pm51fEkabbmw= 1788 A.1.3. S/MIME signed-only multipart/signed over a simple message, No 1789 Header Protection 1791 This is a signed-only S/MIME message via PKCS#7 detached signature 1792 (multipart/signed). The payload is a text/plain message. It uses no 1793 header protection. 1795 It has the following structure: 1797 └┬╴multipart/signed 4156 bytes 1798 ├─╴text/plain 224 bytes 1799 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes 1801 Its contents are: 1803 MIME-Version: 1.0 1804 Content-Type: multipart/signed; 1805 protocol="application/pkcs7-signature"; boundary="76c"; 1806 micalg="sha-256" 1807 Subject: smime-multipart 1808 Message-ID: 1809 From: Alice 1810 To: Bob 1811 Date: Sat, 20 Feb 2021 10:02:02 -0500 1813 --76c 1814 MIME-Version: 1.0 1815 Content-Type: text/plain; charset="utf-8" 1816 Content-Transfer-Encoding: 7bit 1818 This is the smime-multipart message. 1820 This is a signed-only S/MIME message via PKCS#7 detached signature 1821 (multipart/signed). The payload is a text/plain message. It uses no 1822 header protection. 1824 -- 1825 Alice 1826 alice@smime.example 1828 --76c 1829 Content-Transfer-Encoding: base64 1830 Content-Type: application/pkcs7-signature; name="smime.p7s" 1832 MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI 1833 hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ 1834 KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx 1835 MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp 1836 dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT 1837 BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj 1838 ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk 1839 acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz 1840 yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa 1841 Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC 1842 N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz 1843 B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK 1844 arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD 1845 AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG 1846 CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 1847 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI 1848 hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F 1849 zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt 1850 jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR 1851 zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 1852 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs 1853 qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 1854 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx 1855 ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl 1856 cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 1857 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG 1858 A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK 1859 AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU 1860 a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz 1861 /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 1862 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ 1863 saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE 1864 ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX 1865 BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu 1866 ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD 1867 VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 1868 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH 1869 G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl 1870 RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 1871 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 1872 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz 1873 OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm 1874 MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX 1875 RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv 1876 cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 1877 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTAyMDJa 1878 MC8GCSqGSIb3DQEJBDEiBCBBQlio2vX/u19qayJ1Cm1QL6VZY0fBeGz9o7nEzCRO 1879 +zANBgkqhkiG9w0BAQEFAASCAQARvwKQYbbPuADZ7KqyO9LuESdEfBxOF80sHKNz 1880 UXrHZo8JdKaKxr/cTAuzBvoTxsmqvzP3ItCBm+javqX22+tHTpqisz5jkoiWyNVS 1881 e+F++YX8mXokgQpY26mZ+15Mv8pYYhptn6zdkRU1+QOwwlDCc6ykkCZeXyc+Hf7c 1882 xqM6SqPMQ+G7wIF6P2jHCId8Xyl7sdbL0i6PjotesHU+7nQsCjgI/iVR/ubWUdFX 1883 CTg8HVy4p683V3Y9DoRNP4MlUdmon8JasHDvA0240JcXxhJn1zEYa4gOnwgu3kh9 1884 3Y+NeucYCT0bXCBq2RLVQSpdNZfScXKL9QvZ3FtB0r6Bmtky 1886 --76c-- 1888 A.1.4. S/MIME encrypted and signed over a simple message, No Header 1889 Protection 1891 This is a encrypted and signed S/MIME message using PKCS#7 1892 envelopedData around signedData. The payload is a text/plain 1893 message. It uses no header protection. 1895 It has the following structure: 1897 └─╴application/pkcs7-mime [smime.p7m] 6720 bytes 1898 ↧ (decrypts to) 1899 └─╴application/pkcs7-mime [smime.p7m] 3960 bytes 1900 ⇩ (unwraps to) 1901 └─╴text/plain 239 bytes 1903 Its contents are: 1905 Content-Transfer-Encoding: base64 1906 Content-Type: application/pkcs7-mime; name="smime.p7m"; 1907 smime-type="enveloped-data" 1908 Subject: smime-enc-signed 1909 Message-ID: 1910 From: Alice 1911 To: Bob 1912 Date: Sat, 20 Feb 2021 10:03:02 -0500 1914 MIITXAYJKoZIhvcNAQcDoIITTTCCE0kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 1915 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 1916 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 1917 Boq0MA0GCSqGSIb3DQEBAQUABIIBAE1K2Qo2Ln5O6L9qgFnOdvuAuXnh2dLiYWIt 1918 x7B9W2VMQCtrxTipZfUe+Y4oV/Rxifp4gChJ2lCgt6A4hHyApD1yNqmR1pCT+ky6 1919 jOJlr907Jzy9nIADEjaeKTIHePPWEWPiF3Otlrvg25NobNAE/dzcSgaS+SHsfPgu 1920 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MmXRwPdrzWASGy/lF0QnrgB0T85+ID58J9VaP78mI/BtKO20wWMTjbabR7J3Rn+8 1991 KW4H6eewVWBqghCnsJQuqibbZeFDjFgJ9kIaTvGD0TBehpp9TidmppXM4Dl4J+V/ 1992 u7dSL257DzlKkk42gK4Cs0P1dZwe888KIABF38AZ8dnWtD492eYxA9We6NB2ru1o 1993 K59oloZdn+slcF3DLfvVpyfkZ8o3EVgAPVXiDfHWuVp1gL8Cv5ahVlk9BJSD1CgC 1994 Vwsm01V1E7QeNh3gNdQI88tu4wh5SVFk4U2cYI+dDMFUVDMzrUI3tKvWXNZOzn4V 1995 Ce6Eu2JPIcCOYUwDHpsq5aj9BPKBguhQQybDpAAkgSZLwhzAD7rEvo8TU8gzZ2KZ 1996 zH506GoFtU4oNinnrvyHX96/bG/VlizOE9YtQNyEfxxSOBsZD9jgd1pG4j/FDF1Z 1997 Ib+KUUo8Y7GKlOu+l+/WIVcp0nIsyIC4zGdM6DThCT6nGrhKboduTgF5NRH/Hf03 1998 Vrbj/ZarK0t1gzbzPgxotZiUfCVEuav9AVqxA2Zq5afs6bRfohqyFqwKHiYV19C4 1999 m00v4HisEFDGG3f5+Zj/x6tnX9QxR81DOomUooh8aYs/iAz0nrKyux6GMHSlj8db 2000 UbvQ+1VvNE3Fj0xu46HkKzGtFqpgXxzDLkE9e7NJ+Hw4tbOLfINQ0qS7iTcjMbwg 2001 snexBuL6rf8NF28EdlqQzCPLZVhnOd1+KKJS7V/M8u/R/y22+IXzFSA2TlxhId09 2002 IduZ3ByCz2HFJfVj7SameC3KANbRnBkdud1hclIBDS5Hhpqk4M8i3zmZRZWgLyjR 2003 edtSaHuJAlHiKgAtQVeIzlL6Ilw3jVoHL0vOdISoQpoWWhejB9f47KRmUbdb5Pxb 2004 Ot2ylXJKYFfoCQUs1xkNAyynSJAJ97yEAZm7aDmE4bjs33pz4L3nYxO/KUY6EB/E 2005 eGgPk3Cdvt2JYY5BuFoxXYRKQgZ06c9mXzavJJXXWQUUB5k2QG0uyKPmwNr2sdJQ 2006 A8ehhmgGws+7qXwZQEcNC3W0vmiGOBDYP3JVJPiNLFVQN9k8ClE7+0emFn2UcNyG 2007 294hO1G0uBPAbCdhAyDnNpVj5RS0EgY647agQHyp/gjSt4XeoaCIKaalb4iGpT+C 2008 4r2BqRcVUCdE3MRQFqiT6ccm+8h8eA7xtMB8c9OgUTEIKk/WSc0DUsCJB62Plgtj 2009 KJ4xXQXTzzUCDMnACFp6mBTd3g2ZbnfHKSyJdAvPigVbA+Qhy2eWUTYpi6yjTIyT 2010 eaQ2qafGppn85oLFkdgdmE3Ty1UxOpAsqLyNlNAa6YT3D/0Jl3VnfhFKlmywWIG6 2011 Z2SLd0r07xoBUuAKHkFUuRauGYbVbU/Frmdylv6I9DhCqV/XEDa/tHOa/LWugvb+ 2012 x5A+g+kZiTiWRRLZYHungyjquAf/zeJsPYRoQEi4KHAQ30xCDk/dhWdhDBnUXT8P 2013 hzMj8VN3yjQA1vMNA5uefj2/+MIkLkz6+XPl/lJNLFHYi+EERgxJ2mFm/s02h9NF 2014 NhyWBsBtsEwi+rVbfcRRBpVjR5MwUohNHMGxwgj7rzvUkDe47ueXDP74j+JclO68 2015 r4jQ3sob123uSYryDHBZxZSbwjFU2ufE8W+XL/NGwTw04alHZfKsH4x4ZbGqwunf 2016 U4lkcOY/ijmuhL5mn2YYUE6w4oywZuLx5WCv2oAvQawMmNP9AeI1jcV9JiKa+8y0 2017 sAa1LzD78Dg4FKO8t3d13Q== 2019 A.1.5. No cryptographic protections over a complex message 2021 This message uses no cryptographic protection at all. Its body is a 2022 multipart/alternative message with an inline image/png attachment. 2024 It has the following structure: 2026 └┬╴multipart/mixed 1357 bytes 2027 ├┬╴multipart/alternative 780 bytes 2028 │├─╴text/plain 206 bytes 2029 │└─╴text/html 290 bytes 2030 └─╴image/png inline 232 bytes 2032 Its contents are: 2034 MIME-Version: 1.0 2035 Content-Type: multipart/mixed; boundary="0f4" 2036 Subject: no-crypto-complex 2037 Message-ID: 2038 From: Alice 2039 To: Bob 2040 Date: Sat, 20 Feb 2021 12:00:02 -0500 2042 --0f4 2043 MIME-Version: 1.0 2044 Content-Type: multipart/alternative; boundary="384" 2046 --384 2047 Content-Type: text/plain; charset="us-ascii" 2048 MIME-Version: 1.0 2049 Content-Transfer-Encoding: 7bit 2051 This is the no-crypto-complex message. 2053 This message uses no cryptographic protection at all. Its body is a 2054 multipart/alternative message with an inline image/png attachment. 2056 -- 2057 Alice 2058 alice@smime.example 2059 --384 2060 Content-Type: text/html; charset="us-ascii" 2061 MIME-Version: 1.0 2062 Content-Transfer-Encoding: 7bit 2064 2065

This is the no-crypto-complex message.

2066

This message uses no cryptographic protection at all. Its body is a 2067 multipart/alternative message with an inline image/png attachment.

2068

--
Alice
alice@smime.example

2069 --384-- 2071 --0f4 2072 Content-Type: image/png 2073 Content-Transfer-Encoding: base64 2074 Content-Disposition: inline 2076 iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA 2077 MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ 2078 sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli 2079 vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== 2081 --0f4-- 2083 A.1.6. S/MIME signed-only signedData over a complex message, No Header 2084 Protection 2086 This is a signed-only S/MIME message via PKCS#7 signedData. The 2087 payload is a multipart/alternative message with an inline image/png 2088 attachment. It uses no header protection. 2090 It has the following structure: 2092 └─╴application/pkcs7-mime [smime.p7m] 5229 bytes 2093 ⇩ (unwraps to) 2094 └┬╴multipart/mixed 1274 bytes 2095 ├┬╴multipart/alternative 868 bytes 2096 │├─╴text/plain 258 bytes 2097 │└─╴text/html 339 bytes 2098 └─╴image/png inline 236 bytes 2100 Its contents are: 2102 Content-Transfer-Encoding: base64 2103 Content-Type: application/pkcs7-mime; name="smime.p7m"; 2104 smime-type="signed-data" 2105 Subject: smime-one-part-complex 2106 Message-ID: 2107 From: Alice 2108 To: Bob 2109 Date: Sat, 20 Feb 2021 12:01:02 -0500 2111 MIIPEQYJKoZIhvcNAQcCoIIPAjCCDv4CAQExDTALBglghkgBZQMEAgEwggU6Bgkq 2112 hkiG9w0BBwGgggUrBIIFJ01JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 2113 IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9ImM4YiINCg0KLS1jOGINCk1JTUUt 2114 VmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6IG11bHRpcGFydC9hbHRlcm5hdGl2 2115 ZTsgYm91bmRhcnk9ImM4MSINCg0KLS1jODENCkNvbnRlbnQtVHlwZTogdGV4dC9w 2116 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M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8A0enITGXnoEkAFvvjiCq 2159 h64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQsqm6hvrDTqNpHNZ015fOU 2160 Rza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV57XV/QqmiXDr0+GrOmqnX 2161 MA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBT 2162 IFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENlcnRpZmljYXRpb24gQXV0 2163 aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3MDY1NDE4WjA7MQ0wCwYD 2164 VQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUGA1UEAxMOQWxpY2UgTG92 2165 ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC09InoWDgWPk2a 2166 f0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHUa4xQUl5JO6VqY18LANwO 2167 Rjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz/evPgP96wV+z4TtAwW2Z 2168 34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3SryCqeHEFbZFkB4urMk4 2169 xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQsaqpo1d3f9jSkbtAV5w3 2170 vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgEykRiVokFQgqQ7XNDU+r3 2171 SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAXBgNVHSAEEDAOMAwGCmCG 2172 SAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUuZXhhbXBsZTATBgNVHSUE 2173 DDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYDVR0OBBYEFLv2zLItHQYS 2174 HJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn8QkoZTYaZxxodvRZMA0G 2175 CSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOHG25nY/0eNARD6/oF0/sY 2176 onX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZlRAzEf7GHqgB/NyjOad3p 2177 dpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524bKZa1oPTUNlm6QpivtqD 2178 IdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp7poIccGE6I9Tsg+RrOA9 2179 iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtzOKypyQ3eoZ6EPazXqMyH 2180 AVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEmMYICADCCAfwCAQEwbDBV 2181 MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2Ft 2182 cGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eQITN0EFee11f0Kp 2183 olw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG9w0BCQMxCwYJKoZIhvcN 2184 AQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNzAxMDJaMC8GCSqGSIb3DQEJBDEi 2185 BCCBo3TZITs9IUGlq1clkkamrYq1pC+qAOmbM6mBrJaWJDANBgkqhkiG9w0BAQEF 2186 AASCAQARpMjNRbLD+Z682oraEKCbEbDsym9Mrdu6nkcZ+ivEj+AHTU9rt+LBdvTb 2187 gHEKrWW8/HJ8C9eybTU4XJlVzbvGLRFhLPrLNz23qygzUH9AJ3nONY9eGAHLRagc 2188 Ij3L+IAoRjfC3KO00s0/rLfb/l4EmMLCUDJlShrsqCrFfXQxKi9dWWvVZUzEsGqG 2189 lhkY58o+No6WN/0SsWTHNNXrg1RKql5PyaHfWtySsMZjUOCJrlQDMeKBSE7dpTjX 2190 wA5N/m9eBDASJyzlxdLOHGfJ1uWn/VR0Lm4xbscAdVJEm5gaH9o4QKf7jXAl7O9n 2191 yuP+ZEhRpnjHfJ3XjFKuHiZ36Yon 2193 A.1.7. S/MIME signed-only multipart/signed over a complex message, No 2194 Header Protection 2196 This is a signed-only S/MIME message via PKCS#7 detached signature 2197 (multipart/signed). The payload is a multipart/alternative message 2198 with an inline image/png attachment. It uses no header protection. 2200 It has the following structure: 2202 └┬╴multipart/signed 5185 bytes 2203 ├┬╴multipart/mixed 1330 bytes 2204 │├┬╴multipart/alternative 924 bytes 2205 ││├─╴text/plain 278 bytes 2206 ││└─╴text/html 362 bytes 2207 │└─╴image/png inline 232 bytes 2208 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes 2210 Its contents are: 2212 MIME-Version: 1.0 2213 Content-Type: multipart/signed; 2214 protocol="application/pkcs7-signature"; boundary="d66"; 2215 micalg="sha-256" 2216 Subject: smime-multipart-complex 2217 Message-ID: 2218 From: Alice 2219 To: Bob 2220 Date: Sat, 20 Feb 2021 12:02:02 -0500 2222 --d66 2223 MIME-Version: 1.0 2224 Content-Type: multipart/mixed; boundary="7fe" 2226 --7fe 2227 MIME-Version: 1.0 2228 Content-Type: multipart/alternative; boundary="848" 2230 --848 2231 Content-Type: text/plain; charset="us-ascii" 2232 MIME-Version: 1.0 2233 Content-Transfer-Encoding: 7bit 2235 This is the smime-multipart-complex message. 2237 This is a signed-only S/MIME message via PKCS#7 detached signature 2238 (multipart/signed). The payload is a multipart/alternative message 2239 with an inline image/png attachment. It uses no header protection. 2241 -- 2242 Alice 2243 alice@smime.example 2244 --848 2245 Content-Type: text/html; charset="us-ascii" 2246 MIME-Version: 1.0 2247 Content-Transfer-Encoding: 7bit 2249 2250

This is the smime-multipart-complex message.

2251

This is a signed-only S/MIME message via PKCS#7 detached signature 2252 (multipart/signed). The payload is a multipart/alternative message 2253 with an inline image/png attachment. It uses no header protection.

2254

--
Alice
alice@smime.example

2255 --848-- 2257 --7fe 2258 Content-Type: image/png 2259 Content-Transfer-Encoding: base64 2260 Content-Disposition: inline 2262 iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA 2263 MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ 2264 sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli 2265 vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== 2267 --7fe-- 2269 --d66 2270 Content-Transfer-Encoding: base64 2271 Content-Type: application/pkcs7-signature; name="smime.p7s" 2273 MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI 2274 hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ 2275 KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx 2276 MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp 2277 dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT 2278 BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj 2279 ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk 2280 acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz 2281 yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa 2282 Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC 2283 N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz 2284 B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK 2285 arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD 2286 AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG 2287 CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 2288 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI 2289 hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F 2290 zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt 2291 jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR 2292 zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 2293 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs 2294 qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 2295 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx 2296 ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl 2297 cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 2298 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG 2299 A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK 2300 AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU 2301 a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz 2302 /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 2303 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ 2304 saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE 2305 ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX 2306 BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu 2307 ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD 2308 VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 2309 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH 2310 G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl 2311 RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 2312 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 2313 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz 2314 OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm 2315 MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX 2316 RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv 2317 cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 2318 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNzAyMDJa 2319 MC8GCSqGSIb3DQEJBDEiBCCpaVCRppoO9Sw65TWLCDTpvw7N8HHyZsFXr4qP43kV 2320 mjANBgkqhkiG9w0BAQEFAASCAQCW76eXVAXnm6vEII1CD4QNEh2kpQeBr4/NyspF 2321 5VopKxNrBRfQs000ewQ0y2n07BUJtVyZrZOdrP5cG6K9KByxVGgpRY2Uyllz6hUA 2322 K12zvtU3hU5oKTKVgNtDMh8qCMVqYdJzFSZ+exTGLIaN88bMNErzw9Id1F5TpJYF 2323 ISUP1mXY1+GpjuXo5WEM8c7cfFH2/uDw3PSFILmuXowedbBptFH7ccGhNg6huY2c 2324 AxIADVfW6YVG3SWVAaTHUM0QmvG9AyV4d0dce+p4aoZfhUfjAF6nWIRLcrfu18z5 2325 FBxL02+VfWaYOg0d3TgScxQgE2vjAgdz+TqDbQpPriQXf/h7 2327 --d66-- 2329 A.1.8. S/MIME encrypted and signed over a complex message, No Header 2330 Protection 2332 This is a encrypted and signed S/MIME message using PKCS#7 2333 envelopedData around signedData. The payload is a multipart/ 2334 alternative message with an inline image/png attachment. It uses no 2335 header protection. 2337 It has the following structure: 2339 └─╴application/pkcs7-mime [smime.p7m] 8670 bytes 2340 ↧ (decrypts to) 2341 └─╴application/pkcs7-mime [smime.p7m] 5408 bytes 2342 ⇩ (unwraps to) 2343 └┬╴multipart/mixed 1342 bytes 2344 ├┬╴multipart/alternative 936 bytes 2345 │├─╴text/plain 293 bytes 2346 │└─╴text/html 374 bytes 2347 └─╴image/png inline 236 bytes 2349 Its contents are: 2351 Content-Transfer-Encoding: base64 2352 Content-Type: application/pkcs7-mime; name="smime.p7m"; 2353 smime-type="enveloped-data" 2354 Subject: smime-enc-signed-complex 2355 Message-ID: 2356 From: Alice 2357 To: Bob 2358 Date: Sat, 20 Feb 2021 12:03:02 -0500 2360 MIIY/AYJKoZIhvcNAQcDoIIY7TCCGOkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 2361 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 2362 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 2363 Boq0MA0GCSqGSIb3DQEBAQUABIIBABKoUk6G/5pRCkn0XsCial0oDti/uEUw6E3T 2364 PAqN2WP4KjYkf10gKJZNaJYEGhOmHfu1r53FsuW3jq2IS3A16AkpZHY7ROluKpAV 2365 3qkTBDqBnsC16f3q5uQxCWZ3DOJDvf9X48iASbXArXOjGk14lgjW8GeC5stnK9s9 2366 4O5KpkCQges3lVWngSPYxGkDgyp1xjvftn7M/EnXAKf6F2ujLp7is9EgEjdK52zV 2367 GE6Pqqeq8hy7Cyqlz5pWn76MTbgjg7OxXFzDCTePXiDPUCrOoCxwHpj6yo/bfbrE 2368 HDq5rZXDY4ZWyHGpTQbVLA8zMMJqoVXiFz8NqNeDwY7ApaODpU4wggGEAgEAMGww 2369 VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh 2370 bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 2371 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAhI15RwR9LLMR9+cR4l8VmlBW 2372 PuYAz1vENb+Il48IFNmnN2xqAU7ATw+HvD2noH+6yqf9N0fXz9/ARD0GtsGrG+wS 2373 s0gYC34/x1zwZ0DWIvrVq5yPsly4Qd5KkFEo8ACtFJFfInL3KaHg7SMHYObg6OcT 2374 izGKSOp6wBNnVlvknSoIGjdg7IMFO2dVeqUXCkpf7N944kqvfxJXKPcOgleAG0Qw 2375 n2v/gJtM0hsB6lQhh+vc5RUYIfmX4N5hNW7Polz3NnYrPPB0QFBGyAiCuFFEoWa/ 2376 nj+DWJbH+cYYyWXBMVcqasx05FCNkuX+RcemRzDHyrMQEs1TFj7NxSYjvjCaXjCC 2377 Fc4GCSqGSIb3DQEHATAdBglghkgBZQMEAQIEED8PrzsI9SpFxgbjoB0E0g2AghWg 2378 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Signed-only Messages 2497 These messages are signed-only, using different schemes of header 2498 protection and different S/MIME structure. The use no Header 2499 Confidentiality Policy because the hcp is only relevant when a 2500 message is encrypted. 2502 A.2.1. S/MIME signed-only signedData over a simple message, Wrapped 2503 Message 2505 This is a signed-only S/MIME message via PKCS#7 signedData. The 2506 payload is a text/plain message. It uses the Wrapped Message header 2507 protection scheme. 2509 It has the following structure: 2511 └─╴application/pkcs7-mime [smime.p7m] 4213 bytes 2512 ⇩ (unwraps to) 2513 └┬╴message/rfc822 566 bytes 2514 └─╴text/plain 228 bytes 2516 Its contents are: 2518 Content-Transfer-Encoding: base64 2519 Content-Type: application/pkcs7-mime; name="smime.p7m"; 2520 smime-type="signed-data" 2521 Subject: smime-one-part-wrapped 2522 Message-ID: 2523 From: Alice 2524 To: Bob 2525 Date: Sat, 20 Feb 2021 10:04:02 -0500 2527 MIIMIwYJKoZIhvcNAQcCoIIMFDCCDBACAQExDTALBglghkgBZQMEAgEwggJMBgkq 2528 hkiG9w0BBwGgggI9BIICOU1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 2529 IG1lc3NhZ2UvcmZjODIyOyBmb3J3YXJkZWQ9Im5vIg0KDQpNSU1FLVZlcnNpb246 2530 IDEuMApDb250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InV0Zi04IgpD 2531 b250ZW50LVRyYW5zZmVyLUVuY29kaW5nOiA3Yml0ClN1YmplY3Q6IHNtaW1lLW9u 2532 ZS1wYXJ0LXdyYXBwZWQKTWVzc2FnZS1JRDogPHNtaW1lLW9uZS1wYXJ0LXdyYXBw 2533 ZWRAbGhwLmV4YW1wbGU+CkZyb206IEFsaWNlIDxhbGljZUBzbWltZS5leGFtcGxl 2534 PgpUbzogQm9iIDxib2JAc21pbWUuZXhhbXBsZT4KRGF0ZTogU2F0LCAyMCBGZWIg 2535 MjAyMSAxMDowNDowMiAtMDUwMAoKVGhpcyBpcyB0aGUgc21pbWUtb25lLXBhcnQt 2536 d3JhcHBlZCBtZXNzYWdlLgoKVGhpcyBpcyBhIHNpZ25lZC1vbmx5IFMvTUlNRSBt 2537 ZXNzYWdlIHZpYSBQS0NTIzcgc2lnbmVkRGF0YS4gIFRoZQpwYXlsb2FkIGlzIGEg 2538 dGV4dC9wbGFpbiBtZXNzYWdlLiBJdCB1c2VzIHRoZSBXcmFwcGVkIE1lc3NhZ2Ug 2539 aGVhZGVyCnByb3RlY3Rpb24gc2NoZW1lLgoKLS0gCkFsaWNlCmFsaWNlQHNtaW1l 2540 LmV4YW1wbGUKoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQw 2541 DQYJKoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMg 2542 V0cxMTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRo 2543 b3JpdHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNV 2544 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3Zl 2545 bGFjZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gB 2546 UCfkacKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXP 2547 mrszyidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEF 2548 XgOaGdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41ko 2549 aZXCN5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX 2550 +TWzB2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iP 2551 sIVKarUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZI 2552 AWUDAgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQM 2553 MAoGCCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkV 2554 fAEj8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJ 2555 KoZIhvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtK 2556 tl4FzkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3M 2557 RsMtjH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0 2558 LIZRzWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXw 2559 fDz8A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyu 2560 OfQsqm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3 2561 QQV57XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElF 2562 VEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNB 2563 IENlcnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIw 2564 OTI3MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEX 2565 MBUGA1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw 2566 ggEKAoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo 2567 7sHUa4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+95 2568 0MFz/evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYW 2569 Tut3SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfC 2570 n+IQsaqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9 2571 COgEykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIw 2572 ADAXBgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21p 2573 bWUuZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAw 2574 HQYDVR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwH 2575 Fwyn8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4K 2576 kkOHG25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30Uxf 2577 yrZlRAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HV 2578 X524bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP 2579 0Qhp7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+ 2580 JJtzOKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSz 2581 NnEmMYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1Q 2582 UyBXRzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1 2583 dGhvcml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkq 2584 hkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA0 2585 MDJaMC8GCSqGSIb3DQEJBDEiBCCt+Ik56mZTd2mpSgOXM38dS7jM5alU2FDX9/58 2586 cga1szANBgkqhkiG9w0BAQEFAASCAQCxKLkx5li14OIOcH2tcWqcsQilPLgQ30ck 2587 qhJL2X9/Cl22ibOGNwL8w3qSEBeG1a+WtHw3bSqJx1ciRYcLs16ms23no5QoZ0pU 2588 fRLmQuTEgObCf+syiTGnWLj8e+2aRVP1L9yEIbin6+hFyp4s393zYhdMOPAP2ruI 2589 lg+BxoWXUjXso+8lPgqLawA+9KMI6tQZMnwI9LpGJmZfoSXdHWqWtjdotzZpqsKm 2590 Ihr8DBKtUetqgZ2zqDO3zo3W2L6EmNM05BJUmqwAt/cN+X9kws5dAqtHDQhPNTa1 2591 WUX0oTTkMzn1RAlOxfowEStSnfDOOzIqg+L7LgiMw9jhIgP4/uB2 2593 A.2.2. S/MIME signed-only multipart/signed over a simple message, 2594 Wrapped Message 2596 This is a signed-only S/MIME message via PKCS#7 detached signature 2597 (multipart/signed). The payload is a text/plain message. It uses 2598 the Wrapped Message header protection scheme. 2600 It has the following structure: 2602 └┬╴multipart/signed 4451 bytes 2603 ├┬╴message/rfc822 596 bytes 2604 │└─╴text/plain 256 bytes 2605 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes 2607 Its contents are: 2609 MIME-Version: 1.0 2610 Content-Type: multipart/signed; 2611 protocol="application/pkcs7-signature"; boundary="20c"; 2612 micalg="sha-256" 2613 Subject: smime-multipart-wrapped 2614 Message-ID: 2615 From: Alice 2616 To: Bob 2617 Date: Sat, 20 Feb 2021 10:05:02 -0500 2619 --20c 2620 MIME-Version: 1.0 2621 Content-Type: message/rfc822; forwarded="no" 2623 MIME-Version: 1.0 2624 Content-Type: text/plain; charset="utf-8" 2625 Content-Transfer-Encoding: 7bit 2626 Subject: smime-multipart-wrapped 2627 Message-ID: 2628 From: Alice 2629 To: Bob 2630 Date: Sat, 20 Feb 2021 10:05:02 -0500 2632 This is the smime-multipart-wrapped message. 2634 This is a signed-only S/MIME message via PKCS#7 detached signature 2635 (multipart/signed). The payload is a text/plain message. It uses the 2636 Wrapped Message header protection scheme. 2638 -- 2639 Alice 2640 alice@smime.example 2642 --20c 2643 Content-Transfer-Encoding: base64 2644 Content-Type: application/pkcs7-signature; name="smime.p7s" 2646 MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI 2647 hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ 2648 KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx 2649 MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp 2650 dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT 2651 BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj 2652 ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk 2653 acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz 2654 yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa 2655 Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC 2656 N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz 2657 B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK 2658 arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD 2659 AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG 2660 CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 2661 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI 2662 hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F 2663 zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt 2664 jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR 2665 zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 2666 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs 2667 qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 2668 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx 2669 ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl 2670 cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 2671 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG 2672 A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK 2673 AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU 2674 a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz 2675 /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 2676 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ 2677 saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE 2678 ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX 2679 BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu 2680 ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD 2681 VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 2682 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH 2683 G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl 2684 RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 2685 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 2686 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz 2687 OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm 2688 MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX 2689 RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv 2690 cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 2691 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA1MDJa 2692 MC8GCSqGSIb3DQEJBDEiBCCcDIxr7wd3VCCz1VBG9nySvUJ/Fhzo26f78El/UUbj 2693 jTANBgkqhkiG9w0BAQEFAASCAQBUmMGL40IZQmt3Nad/ymEUOLu3Dgfd/nYKuj6P 2694 fjKYJFb9UhwtufZK9/WyVtytLsFJMYHZgUSWU3VbHk1L/cO0469Rbqo6CqlLRJPK 2695 uN2Eul2UCa+3ovMIQ8g0NBflXrdfR0OVRqvfO91hLFkTxLfCDUG8ziRWOLWucgZg 2696 zkVXqEzvFyOtsSbr3GAY817wWgl1+PTFchO4XF+rg7cNysKqGLtjxP9lN3PcURYv 2697 TmooTPY46kheab7ZAzKqQI6go7somKmMqD7UsctMLSVZo+EX5/N9vq5znv7bfpoE 2698 Rgd+NZNQD+VYDIOU1FI5ZjyjHpRmcFpywjvHNbTBGlYhv3q4 2700 --20c-- 2702 A.2.3. S/MIME signed-only signedData over a simple message, Injected 2703 Headers 2705 This is a signed-only S/MIME message via PKCS#7 signedData. The 2706 payload is a text/plain message. It uses the Injected Headers header 2707 protection scheme. 2709 It has the following structure: 2711 └─╴application/pkcs7-mime [smime.p7m] 4185 bytes 2712 ⇩ (unwraps to) 2713 └─╴text/plain 239 bytes 2715 Its contents are: 2717 Content-Transfer-Encoding: base64 2718 Content-Type: application/pkcs7-mime; name="smime.p7m"; 2719 smime-type="signed-data" 2720 Subject: smime-one-part-injected 2721 Message-ID: 2722 From: Alice 2723 To: Bob 2724 Date: Sat, 20 Feb 2021 10:06:02 -0500 2726 MIIMDgYJKoZIhvcNAQcCoIIL/zCCC/sCAQExDTALBglghkgBZQMEAgEwggI3Bgkq 2727 hkiG9w0BBwGgggIoBIICJE1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVRyYW5z 2728 ZmVyLUVuY29kaW5nOiA3Yml0DQpTdWJqZWN0OiBzbWltZS1vbmUtcGFydC1pbmpl 2729 Y3RlZA0KTWVzc2FnZS1JRDogPHNtaW1lLW9uZS1wYXJ0LWluamVjdGVkQGxocC5l 2730 eGFtcGxlPg0KRnJvbTogQWxpY2UgPGFsaWNlQHNtaW1lLmV4YW1wbGU+DQpUbzog 2731 Qm9iIDxib2JAc21pbWUuZXhhbXBsZT4NCkRhdGU6IFNhdCwgMjAgRmViIDIwMjEg 2732 MTA6MDY6MDIgLTA1MDANCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNl 2733 dD0idXRmLTgiOyBwcm90ZWN0ZWQtaGVhZGVycz0idjEiDQoNClRoaXMgaXMgdGhl 2734 IHNtaW1lLW9uZS1wYXJ0LWluamVjdGVkIG1lc3NhZ2UuDQoNClRoaXMgaXMgYSBz 2735 aWduZWQtb25seSBTL01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEu 2736 ICBUaGUNCnBheWxvYWQgaXMgYSB0ZXh0L3BsYWluIG1lc3NhZ2UuIEl0IHVzZXMg 2737 dGhlIEluamVjdGVkIEhlYWRlcnMgaGVhZGVyDQpwcm90ZWN0aW9uIHNjaGVtZS4N 2738 Cg0KLS0gDQpBbGljZQ0KYWxpY2VAc21pbWUuZXhhbXBsZQ0KoIIHpjCCA88wggK3 2739 oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJKoZIhvcNAQENBQAwVTENMAsG 2740 A1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNhbXBsZSBM 2741 QU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwIBcNMTkxMTIwMDY1NDE4 2742 WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExB 2743 TVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFjZTCCASIwDQYJKoZIhvcNAQEB 2744 BQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfkacKTg8cc2OtJ9ZSed6U3jUoi 2745 ZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrszyidmbuZmOpB5voVQfiLYYy3i 2746 Ox7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOaGdmnx4OG/e3p1fIKM0dPzZLo 2747 OAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXCN5XL7wWTLMLeNf9Byb5ksKqU 2748 uqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWzB2zNS2OF+XIVnzRG5DeoULq8 2749 v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVKarUCAwEAAaOBrzCBrDAMBgNV 2750 HRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUDAgEwATAeBgNVHREEFzAVgRNh 2751 bGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoGCCsGAQUFBwMEMA4GA1UdDwEB 2752 /wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj8OeOr83zdw8wHwYDVR0jBBgw 2753 FoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZIhvcNAQENBQADggEBAIFJeKCc 2754 sTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4FzkgRyOg31/+Cw7H8e30iLrPI 2755 FlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMtjH2x9SG91PEM046gfPnc9gMG 2756 HjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZRzWmkw1RF7FOD7PfB5v94M527 2757 4XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8A0enITGXnoEkAFvvjiCqh64P 2758 1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQsqm6hvrDTqNpHNZ015fOURza1 2759 SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV57XV/QqmiXDr0+GrOmqnXMA0G 2760 CSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdH 2761 MTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9y 2762 aXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3MDY1NDE4WjA7MQ0wCwYDVQQK 2763 EwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUGA1UEAxMOQWxpY2UgTG92ZWxh 2764 Y2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC09InoWDgWPk2af0+S 2765 tijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHUa4xQUl5JO6VqY18LANwORjrc 2766 9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz/evPgP96wV+z4TtAwW2Z34rT 2767 iz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3SryCqeHEFbZFkB4urMk4xrIJ 2768 C3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQsaqpo1d3f9jSkbtAV5w3vzfo 2769 g8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgEykRiVokFQgqQ7XNDU+r3SeOW 2770 wks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAXBgNVHSAEEDAOMAwGCmCGSAFl 2771 AwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUuZXhhbXBsZTATBgNVHSUEDDAK 2772 BggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYDVR0OBBYEFLv2zLItHQYSHJeu 2773 KWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn8QkoZTYaZxxodvRZMA0GCSqG 2774 SIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOHG25nY/0eNARD6/oF0/sYonX2 2775 doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZlRAzEf7GHqgB/NyjOad3pdpVY 2776 eDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524bKZa1oPTUNlm6QpivtqDIdqG 2777 JdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp7poIccGE6I9Tsg+RrOA9iCQs 2778 Pn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtzOKypyQ3eoZ6EPazXqMyHAVcs 2779 m0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEmMYICADCCAfwCAQEwbDBVMQ0w 2780 CwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UEAxMoU2FtcGxl 2781 IExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eQITN0EFee11f0Kpolw6 2782 9Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcB 2783 MBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA2MDJaMC8GCSqGSIb3DQEJBDEiBCA7 2784 4grfze+Y7DQEGFAYHyyvRpNkuuZFR0V+RvSTvu4FGDANBgkqhkiG9w0BAQEFAASC 2785 AQB1KYVvQNZpe3EKeM0XhJrlJNxneVmZWFCEl5YFeRsO8FeIwJkV65YtFJKjOVVy 2786 qYuZBGz4MsKaddXxAOXI/Q7cJ+70d9iOc1mL3PD2/U6DOwwhNfJoNSK7miYfMASV 2787 42TMJWTt0T1ORJnvBitjkTuZDus1tp3xwxbrZTa4pyGaXEhBW/Fc4z6L+z8hpQv/ 2788 +6dw3+ORgfc67VTHVnsVVfb0UPrWvdxFdL5xYdqXxlhDsLMEms2ttHHzvjC003Kq 2789 As0xMHEmMpfdL5M69MAjvroOUv0SXETfQaxca7IKd+9xUNNRretZ9xz2kn2uD+k7 2790 unTEyVGeHrWmQMw/8MdvEac/ 2792 A.2.4. S/MIME signed-only multipart/signed over a simple message, 2793 Injected Headers 2795 This is a signed-only S/MIME message via PKCS#7 detached signature 2796 (multipart/signed). The payload is a text/plain message. It uses 2797 the Injected Headers header protection scheme. 2799 It has the following structure: 2801 └┬╴multipart/signed 4417 bytes 2802 ├─╴text/plain 258 bytes 2803 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes 2805 Its contents are: 2807 MIME-Version: 1.0 2808 Content-Type: multipart/signed; 2809 protocol="application/pkcs7-signature"; boundary="12b"; 2810 micalg="sha-256" 2811 Subject: smime-multipart-injected 2812 Message-ID: 2813 From: Alice 2814 To: Bob 2815 Date: Sat, 20 Feb 2021 10:07:02 -0500 2817 --12b 2818 MIME-Version: 1.0 2819 Content-Transfer-Encoding: 7bit 2820 Subject: smime-multipart-injected 2821 Message-ID: 2822 From: Alice 2823 To: Bob 2824 Date: Sat, 20 Feb 2021 10:07:02 -0500 2825 Content-Type: text/plain; charset="utf-8"; protected-headers="v1" 2827 This is the smime-multipart-injected message. 2829 This is a signed-only S/MIME message via PKCS#7 detached signature 2830 (multipart/signed). The payload is a text/plain message. It uses the 2831 Injected Headers header protection scheme. 2833 -- 2834 Alice 2835 alice@smime.example 2837 --12b 2838 Content-Transfer-Encoding: base64 2839 Content-Type: application/pkcs7-signature; name="smime.p7s" 2841 MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI 2842 hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ 2843 KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx 2844 MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp 2845 dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT 2846 BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj 2847 ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk 2848 acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz 2849 yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa 2850 Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC 2851 N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz 2852 B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK 2853 arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD 2854 AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG 2855 CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 2856 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI 2857 hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F 2858 zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt 2859 jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR 2860 zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 2861 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs 2862 qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 2863 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx 2864 ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl 2865 cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 2866 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG 2867 A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK 2868 AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU 2869 a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz 2870 /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 2871 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ 2872 saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE 2873 ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX 2874 BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu 2875 ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD 2876 VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 2877 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH 2878 G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl 2879 RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 2880 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 2881 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz 2882 OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm 2883 MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX 2884 RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv 2885 cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 2886 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNTA3MDJa 2887 MC8GCSqGSIb3DQEJBDEiBCCXRoUdgR7J+TnI6kw8MpGtWVJPCnoAB+XfkDf78dWi 2888 cTANBgkqhkiG9w0BAQEFAASCAQCitU3JsEMd9FhqUu87UxYScDI1pDfZnX1vjges 2889 xBmmSy5lq5vvs+axKK/hTOR7YLSuLJLNwxJgDCPEmHi1hV5Tpj5mLH8qEXu4c+kK 2890 s9is53v0NvibhIvDEpnqNvL/kMVDAk2gTqYHCE2Ij7qcWWNhnGdweMJZsBvLy/Xi 2891 BLaD2t4qHY9lPaeMugDrxThNWEhjoDIoI5f7NpBPYvJgB7b1cJhXqil5weYrJiGr 2892 hyTr56lff+Xjs8qjgrrzdJ8HHeUsxDJulrX8auo+pIKudcu41U8Ben2M9nCiVbEG 2893 aqbbPK7xip5c/YZEaZWYAs8w+dif68J8Eo7QO/kkr45Tt5pf 2895 --12b-- 2897 A.2.5. S/MIME signed-only signedData over a complex message, Wrapped 2898 Message 2900 This is a signed-only S/MIME message via PKCS#7 signedData. The 2901 payload is a multipart/alternative message with an inline image/png 2902 attachment. It uses the Wrapped Message header protection scheme. 2904 It has the following structure: 2906 └─╴application/pkcs7-mime [smime.p7m] 5615 bytes 2907 ⇩ (unwraps to) 2908 └┬╴message/rfc822 1599 bytes 2909 └┬╴multipart/mixed 1535 bytes 2910 ├┬╴multipart/alternative 932 bytes 2911 │├─╴text/plain 282 bytes 2912 │└─╴text/html 366 bytes 2913 └─╴image/png inline 232 bytes 2915 Its contents are: 2917 Content-Transfer-Encoding: base64 2918 Content-Type: application/pkcs7-mime; name="smime.p7m"; 2919 smime-type="signed-data" 2920 Subject: smime-one-part-complex-wrapped 2921 Message-ID: 2922 From: Alice 2923 To: Bob 2924 Date: Sat, 20 Feb 2021 12:04:02 -0500 2926 MIIQLAYJKoZIhvcNAQcCoIIQHTCCEBkCAQExDTALBglghkgBZQMEAgEwggZVBgkq 2927 hkiG9w0BBwGgggZGBIIGQk1JTUUtVmVyc2lvbjogMS4wDQpDb250ZW50LVR5cGU6 2928 IG1lc3NhZ2UvcmZjODIyOyBmb3J3YXJkZWQ9Im5vIg0KDQpNSU1FLVZlcnNpb246 2929 IDEuMApDb250ZW50LVR5cGU6IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9IjNm 2930 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MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtPSJ6Fg4Fj5Nmn9PkrYo 2987 0jTkfCv4TfA/pdO/KLpZbJOAEr0sI7AjaO7B1GuMUFJeSTulamNfCwDcDkY63PQW 2988 l+DILs7GxVwXurhYdZlaV5hcUqVAckPvedDBc/3rz4D/esFfs+E7QMFtmd+K04s+ 2989 A8TCNO12DRVBDpbP4JFD9hsc8prDtpGmFk7rd0q8gqnhxBW2RZAeLqzJOMayCQtw 2990 s1q7ktkNBR2wZX5ICjecF1YJFhX4jrnHwp/iELGqqaNXd3/Y0pG7QFecN7836IPP 2991 dfTMSiPR+peCrhJZwLSewbWXLJe3VMvbvQjoBMpEYlaJBUIKkO1zQ1Pq90njlsJL 2992 OwIDAQABo4GvMIGsMAwGA1UdEwEB/wQCMAAwFwYDVR0gBBAwDjAMBgpghkgBZQMC 2993 ATABMB4GA1UdEQQXMBWBE2FsaWNlQHNtaW1lLmV4YW1wbGUwEwYDVR0lBAwwCgYI 2994 KwYBBQUHAwQwDgYDVR0PAQH/BAQDAgbAMB0GA1UdDgQWBBS79syyLR0GEhyXrilq 2995 kBDTIGZmczAfBgNVHSMEGDAWgBSRMI58BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG 2996 9w0BAQ0FAAOCAQEAc4miNqfOqaBpI3f+CpJDhxtuZ2P9HjQEQ+v6BdP7GKJ19naI 2997 s3BjJOd64roAKHAp+c284VvyVXWJ99FMX8q2ZUQMxH+xh6oAfzcozmnd6XaVWHg4 2998 eHIjSo27PmhKE1oAJKKhDbdbEcZXL2+x1V+duGymWtaD01DZZukKYr7agyHahiXR 2999 n/C9cy31wbqNsy9x0fjPQg6+DqatiQpMz9EIae6aCHHBhOiPU7IPkazgPYgkLD59 3000 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S/MIME signed-only multipart/signed over a complex message, 3015 Wrapped Message 3017 This is a signed-only S/MIME message via PKCS#7 detached signature 3018 (multipart/signed). The payload is a multipart/alternative message 3019 with an inline image/png attachment. It uses the Wrapped Message 3020 header protection scheme. 3022 It has the following structure: 3024 └┬╴multipart/signed 5528 bytes 3025 ├┬╴message/rfc822 1657 bytes 3026 │└┬╴multipart/mixed 1593 bytes 3027 │ ├┬╴multipart/alternative 988 bytes 3028 │ │├─╴text/plain 310 bytes 3029 │ │└─╴text/html 394 bytes 3030 │ └─╴image/png inline 232 bytes 3031 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes 3033 Its contents are: 3035 MIME-Version: 1.0 3036 Content-Type: multipart/signed; 3037 protocol="application/pkcs7-signature"; boundary="932"; 3038 micalg="sha-256" 3039 Subject: smime-multipart-complex-wrapped 3040 Message-ID: 3041 From: Alice 3042 To: Bob 3043 Date: Sat, 20 Feb 2021 12:05:02 -0500 3045 --932 3046 MIME-Version: 1.0 3047 Content-Type: message/rfc822; forwarded="no" 3049 MIME-Version: 1.0 3050 Content-Type: multipart/mixed; boundary="c35" 3051 Subject: smime-multipart-complex-wrapped 3052 Message-ID: 3053 From: Alice 3054 To: Bob 3055 Date: Sat, 20 Feb 2021 12:05:02 -0500 3057 --c35 3058 MIME-Version: 1.0 3059 Content-Type: multipart/alternative; boundary="645" 3061 --645 3062 Content-Type: text/plain; charset="us-ascii" 3063 MIME-Version: 1.0 3064 Content-Transfer-Encoding: 7bit 3066 This is the smime-multipart-complex-wrapped message. 3068 This is a signed-only S/MIME message via PKCS#7 detached signature 3069 (multipart/signed). The payload is a multipart/alternative message 3070 with an inline image/png attachment. It uses the Wrapped Message 3071 header protection scheme. 3073 -- 3074 Alice 3075 alice@smime.example 3076 --645 3077 Content-Type: text/html; charset="us-ascii" 3078 MIME-Version: 1.0 3079 Content-Transfer-Encoding: 7bit 3081 3082

This is the smime-multipart-complex-wrapped message.

3083

This is a signed-only S/MIME message via PKCS#7 detached signature 3084 (multipart/signed). The payload is a multipart/alternative message 3085 with an inline image/png attachment. It uses the Wrapped Message 3086 header protection scheme.

3087

--
Alice
alice@smime.example

3088 --645-- 3090 --c35 3091 Content-Type: image/png 3092 Content-Transfer-Encoding: base64 3093 Content-Disposition: inline 3095 iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA 3096 MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ 3097 sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli 3098 vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== 3100 --c35-- 3102 --932 3103 Content-Transfer-Encoding: base64 3104 Content-Type: application/pkcs7-signature; name="smime.p7s" 3106 MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI 3107 hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ 3108 KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx 3109 MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp 3110 dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT 3111 BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj 3112 ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk 3113 acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz 3114 yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa 3115 Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC 3116 N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz 3117 B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK 3118 arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD 3119 AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG 3120 CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 3121 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI 3122 hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F 3123 zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt 3124 jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR 3125 zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 3126 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs 3127 qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 3128 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx 3129 ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl 3130 cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 3131 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG 3132 A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK 3133 AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU 3134 a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz 3135 /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 3136 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ 3137 saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE 3138 ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX 3139 BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu 3140 ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD 3141 VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 3142 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH 3143 G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl 3144 RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 3145 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 3146 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz 3147 OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm 3148 MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX 3149 RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv 3150 cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 3151 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNzA1MDJa 3152 MC8GCSqGSIb3DQEJBDEiBCAqHXFyYQoKOPnaQ8OYqY4ornV0eciFU8bWD8ky9iEo 3153 CjANBgkqhkiG9w0BAQEFAASCAQAPH0Gm13RZy3gpCgSpM94kN7gG0Qz7gYXsP10Y 3154 +A4JB3xAPM1deb6TWBBbmoX8KktiMIIQQz+im/6ab96G5VlvSXpaAsHjTg8pkvMS 3155 K220ePIQLYGMgbf/h/CDO6kXr4D74QPwhaRzo/DKErgwlvY+osiwrC/srFXyv6M8 3156 673VBGD5XXq8d8LSYQjiSpAQjyGu6Ddo4hZdRNzDQU6a6HRD6qYmaYszb9z6HMHL 3157 AR28J5t4YynW2Hr8/4HSZ5YMt+sXjm1nsGGqLsOdxo6VmgKSiC2nhx7QbJhqevQL 3158 CJWufMVWkvIX74TyfK6W0hl1x/pw0YfHnZMimppl69rRSEsF 3160 --932-- 3162 A.2.7. S/MIME signed-only signedData over a complex message, Injected 3163 Headers 3165 This is a signed-only S/MIME message via PKCS#7 signedData. The 3166 payload is a multipart/alternative message with an inline image/png 3167 attachment. It uses the Injected Headers header protection scheme. 3169 It has the following structure: 3171 └─╴application/pkcs7-mime [smime.p7m] 5631 bytes 3172 ⇩ (unwraps to) 3173 └┬╴multipart/mixed 1565 bytes 3174 ├┬╴multipart/alternative 936 bytes 3175 │├─╴text/plain 292 bytes 3176 │└─╴text/html 373 bytes 3177 └─╴image/png inline 236 bytes 3179 Its contents are: 3181 Content-Transfer-Encoding: base64 3182 Content-Type: application/pkcs7-mime; name="smime.p7m"; 3183 smime-type="signed-data" 3184 Subject: smime-one-part-complex-injected 3185 Message-ID: 3186 From: Alice 3187 To: Bob 3188 Date: Sat, 20 Feb 2021 12:06:02 -0500 3190 MIIQOQYJKoZIhvcNAQcCoIIQKjCCECYCAQExDTALBglghkgBZQMEAgEwggZiBgkq 3191 hkiG9w0BBwGgggZTBIIGT01JTUUtVmVyc2lvbjogMS4wDQpTdWJqZWN0OiBzbWlt 3192 ZS1vbmUtcGFydC1jb21wbGV4LWluamVjdGVkDQpNZXNzYWdlLUlEOiA8c21pbWUt 3193 b25lLXBhcnQtY29tcGxleC1pbmplY3RlZEBsaHAuZXhhbXBsZT4NCkZyb206IEFs 3194 aWNlIDxhbGljZUBzbWltZS5leGFtcGxlPg0KVG86IEJvYiA8Ym9iQHNtaW1lLmV4 3195 YW1wbGU+DQpEYXRlOiBTYXQsIDIwIEZlYiAyMDIxIDEyOjA2OjAyIC0wNTAwDQpD 3196 b250ZW50LVR5cGU6IG11bHRpcGFydC9taXhlZDsgYm91bmRhcnk9ImNmZiI7IHBy 3197 b3RlY3RlZC1oZWFkZXJzPSJ2MSINCg0KLS1jZmYNCk1JTUUtVmVyc2lvbjogMS4w 3198 DQpDb250ZW50LVR5cGU6IG11bHRpcGFydC9hbHRlcm5hdGl2ZTsgYm91bmRhcnk9 3199 IjdiZSINCg0KLS03YmUNCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNl 3200 dD0idXMtYXNjaWkiDQpNSU1FLVZlcnNpb246IDEuMA0KQ29udGVudC1UcmFuc2Zl 3201 ci1FbmNvZGluZzogN2JpdA0KDQpUaGlzIGlzIHRoZSBzbWltZS1vbmUtcGFydC1j 3202 b21wbGV4LWluamVjdGVkIG1lc3NhZ2UuDQoNClRoaXMgaXMgYSBzaWduZWQtb25s 3203 eSBTL01JTUUgbWVzc2FnZSB2aWEgUEtDUyM3IHNpZ25lZERhdGEuICBUaGUNCnBh 3204 eWxvYWQgaXMgYSBtdWx0aXBhcnQvYWx0ZXJuYXRpdmUgbWVzc2FnZSB3aXRoIGFu 3205 IGlubGluZSBpbWFnZS9wbmcNCmF0dGFjaG1lbnQuIEl0IHVzZXMgdGhlIEluamVj 3206 dGVkIEhlYWRlcnMgaGVhZGVyIHByb3RlY3Rpb24gc2NoZW1lLg0KDQotLSANCkFs 3207 aWNlDQphbGljZUBzbWltZS5leGFtcGxlDQotLTdiZQ0KQ29udGVudC1UeXBlOiB0 3208 ZXh0L2h0bWw7IGNoYXJzZXQ9InVzLWFzY2lpIg0KTUlNRS1WZXJzaW9uOiAxLjAN 3209 CkNvbnRlbnQtVHJhbnNmZXItRW5jb2Rpbmc6IDdiaXQNCg0KPGh0bWw+PGhlYWQ+ 3210 PHRpdGxlPjwvdGl0bGU+PC9oZWFkPjxib2R5Pg0KPHA+VGhpcyBpcyB0aGUgPGI+ 3211 c21pbWUtb25lLXBhcnQtY29tcGxleC1pbmplY3RlZDwvYj4gbWVzc2FnZS48L3A+ 3212 DQo8cD5UaGlzIGlzIGEgc2lnbmVkLW9ubHkgUy9NSU1FIG1lc3NhZ2UgdmlhIFBL 3213 Q1MjNyBzaWduZWREYXRhLiAgVGhlDQpwYXlsb2FkIGlzIGEgbXVsdGlwYXJ0L2Fs 3214 dGVybmF0aXZlIG1lc3NhZ2Ugd2l0aCBhbiBpbmxpbmUgaW1hZ2UvcG5nDQphdHRh 3215 Y2htZW50LiBJdCB1c2VzIHRoZSBJbmplY3RlZCBIZWFkZXJzIGhlYWRlciBwcm90 3216 ZWN0aW9uIHNjaGVtZS48L3A+DQo8cD48dHQ+LS0gPGJyLz5BbGljZTxici8+YWxp 3217 Y2VAc21pbWUuZXhhbXBsZTwvdHQ+PC9wPg0KLS03YmUtLQ0KDQotLWNmZg0KQ29u 3218 dGVudC1UeXBlOiBpbWFnZS9wbmcNCkNvbnRlbnQtVHJhbnNmZXItRW5jb2Rpbmc6 3219 IGJhc2U2NA0KQ29udGVudC1EaXNwb3NpdGlvbjogaW5saW5lDQoNCmlWQk9SdzBL 3220 R2dvQUFBQU5TVWhFVWdBQUFCUUFBQUFVQ0FZQUFBQ05pUjBOQUFBQWNFbEVRVlI0 3221 MnVWVE94YkENCk1BZ1M3MzluTzNUcFJ3MjBkcXBiZkFSUUVqT3l3aXdZbkN0a0RL 3222 bmJjTGs2NnNxbFQrenQ5Y2lka0UrNkt3a1oNCnNncnpmY3FWTXBMMmpvMDQ0N2dZ 3223 RHBlQXJrK09uSkhrSWhBZlRQUmljaWhBZjVZSnJ3N3ZqdjBaV1JXTS91bGkNCnZk 3224 UGYxUVoya0REOXhwcGQ4d0FBQUFCSlJVNUVya0pnZ2c9PQ0KDQotLWNmZi0tDQqg 3225 ggemMIIDzzCCAregAwIBAgITDy0lvRE5l0rOQlSHoe49NAaKtDANBgkqhkiG9w0B 3226 AQ0FADBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzExMC8GA1UE 3227 AxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAgFw0x 3228 OTExMjAwNjU0MThaGA8yMDUyMDkyNzA2NTQxOFowOzENMAsGA1UEChMESUVURjER 3229 MA8GA1UECxMITEFNUFMgV0cxFzAVBgNVBAMTDkFsaWNlIExvdmVsYWNlMIIBIjAN 3230 BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmpUp+ovBouOP6AFQJ+RpwpODxxzY 3231 60n1lJ53pTeNSiJlWkwtw/cxQq0t4uD2vWYB8gOUH/CVt2Zp1c+auzPKJ2Zu5mY6 3232 kHm+hVB+IthjLeI7Htg6rNeuXq50/TuTSxX5R1I1EXGt8p6hAQVeA5oZ2afHg4b9 3233 7enV8gozR0/Nkug4AkXmbk7THNc8vvjMUJanZ/VmS4TgDqXjWShplcI3lcvvBZMs 3234 wt41/0HJvmSwqpS6oQcAx3Weag0yCNj1V9V9yu/3DjcYbwW2lJf5NbMHbM1LY4X5 3235 chWfNEbkN6hQury/zxnlsukgn+fHbqvwDhJLAgFpW/jA/EB/WI+whUpqtQIDAQAB 3236 o4GvMIGsMAwGA1UdEwEB/wQCMAAwFwYDVR0gBBAwDjAMBgpghkgBZQMCATABMB4G 3237 A1UdEQQXMBWBE2FsaWNlQHNtaW1lLmV4YW1wbGUwEwYDVR0lBAwwCgYIKwYBBQUH 3238 AwQwDgYDVR0PAQH/BAQDAgUgMB0GA1UdDgQWBBSiU0HVRDyAKRV8ASPw546vzfN3 3239 DzAfBgNVHSMEGDAWgBSRMI58BxcMp/EJKGU2GmccaHb0WTANBgkqhkiG9w0BAQ0F 3240 AAOCAQEAgUl4oJyxMpwWpAylOvK6NEbMl1gD5H14EC4Muxq1u0q2XgXOSBHI6DfX 3241 /4LDsfx7fSIus8gWVY3WqMeuOA7IizkBD+GDEu8uKveERRXZncxGwy2MfbH1Ib3U 3242 8QzTjqB8+dz2AwYeMxODWq9opwtA/lTOkRg8uuivZfg/m5fFo/QshlHNaaTDVEXs 3243 U4Ps98Hm/3gznbvhdjFbZbi4oZ3tAadRlE5K9JiQaJYOnUmGpfB8PPwDR6chMZee 3244 gSQAW++OIKqHrg/WEh4yiuPfqmAvX2hZkPpivNJYdTPUXTSO7K459CyqbqG+sNOo 3245 2kc1nTXl85RHNrVKQK+L0YWY1Q+hWDCCA88wggK3oAMCAQICEzdBBXntdX9CqaJc 3246 OvT4as6aqdcwDQYJKoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UE 3247 CxMITEFNUFMgV0cxMTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNh 3248 dGlvbiBBdXRob3JpdHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MTha 3249 MDsxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5B 3250 bGljZSBMb3ZlbGFjZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALT0 3251 iehYOBY+TZp/T5K2KNI05Hwr+E3wP6XTvyi6WWyTgBK9LCOwI2juwdRrjFBSXkk7 3252 pWpjXwsA3A5GOtz0FpfgyC7OxsVcF7q4WHWZWleYXFKlQHJD73nQwXP968+A/3rB 3253 X7PhO0DBbZnfitOLPgPEwjTtdg0VQQ6Wz+CRQ/YbHPKaw7aRphZO63dKvIKp4cQV 3254 tkWQHi6syTjGsgkLcLNau5LZDQUdsGV+SAo3nBdWCRYV+I65x8Kf4hCxqqmjV3d/ 3255 2NKRu0BXnDe/N+iDz3X0zEoj0fqXgq4SWcC0nsG1lyyXt1TL270I6ATKRGJWiQVC 3256 CpDtc0NT6vdJ45bCSzsCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQ 3257 MA4wDAYKYIZIAWUDAgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxl 3258 MBMGA1UdJQQMMAoGCCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIGwDAdBgNVHQ4EFgQU 3259 u/bMsi0dBhIcl64papAQ0yBmZnMwHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpn 3260 HGh29FkwDQYJKoZIhvcNAQENBQADggEBAHOJojanzqmgaSN3/gqSQ4cbbmdj/R40 3261 BEPr+gXT+xiidfZ2iLNwYyTneuK6AChwKfnNvOFb8lV1iffRTF/KtmVEDMR/sYeq 3262 AH83KM5p3el2lVh4OHhyI0qNuz5oShNaACSioQ23WxHGVy9vsdVfnbhsplrWg9NQ 3263 2WbpCmK+2oMh2oYl0Z/wvXMt9cG6jbMvcdH4z0IOvg6mrYkKTM/RCGnumghxwYTo 3264 j1OyD5Gs4D2IJCw+fX5ODxh52MbNRYXTus2ZPRPM8JXNQC4GWv4km3M4rKnJDd6h 3265 noQ9rNeozIcBVyybQYjfrgg4DRvw9Ksk22OH4ConlB8f7R7s1LM2cSYxggIAMIIB 3266 /AIBATBsMFUxDTALBgNVBAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYD 3267 VQQDEyhTYW1wbGUgTEFNUFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhM3 3268 QQV57XV/QqmiXDr0+GrOmqnXMAsGCWCGSAFlAwQCAaBpMBgGCSqGSIb3DQEJAzEL 3269 BgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTIxMDIyMDE3MDYwMlowLwYJKoZI 3270 hvcNAQkEMSIEIEZJTcpCQRTwXEI88+nlLqN3b7JQ6wZ3y/JlosQRxxY4MA0GCSqG 3271 SIb3DQEBAQUABIIBAEj1f7sJy7g9/S/3wXfUqyyg/3Sr/4H7n/Wyxg+FP74Bi0Km 3272 Z01zoauH8fpjsOg0fS/ll14j69FCkaFUqHYotT6kojdodBRM36IGMIHEPPYH6pAL 3273 4K4CPk62J9PWRwlX+6HYPr+WDfSjzGAL5mDTzYVAuu2aUn46SmTUVNDv3UBaxQCS 3274 sghtVe1snSHpJYz3LciIWyKrE+Kpw+g6cb9hVY/a4p9jHu11x7MfCQddVg2qjZsO 3275 9TH1X9hfSzxV6bmFRZ39+MU/mOV2pxVYXyDnk6BX48PVx7C5tFWDtr+hB5dEQ93i 3276 sQt3VRgv6NwEiyxqfxyQhHgpJY2+DqhoFgwbhkI= 3278 A.2.8. S/MIME signed-only multipart/signed over a complex message, 3279 Injected Headers 3281 This is a signed-only S/MIME message via PKCS#7 detached signature 3282 (multipart/signed). The payload is a multipart/alternative message 3283 with an inline image/png attachment. It uses the Injected Headers 3284 header protection scheme. 3286 It has the following structure: 3288 └┬╴multipart/signed 5496 bytes 3289 ├┬╴multipart/mixed 1623 bytes 3290 │├┬╴multipart/alternative 992 bytes 3291 ││├─╴text/plain 312 bytes 3292 ││└─╴text/html 396 bytes 3293 │└─╴image/png inline 232 bytes 3294 └─╴application/pkcs7-signature [smime.p7s] 3429 bytes 3296 Its contents are: 3298 MIME-Version: 1.0 3299 Content-Type: multipart/signed; 3300 protocol="application/pkcs7-signature"; boundary="a23"; 3301 micalg="sha-256" 3302 Subject: smime-multipart-complex-injected 3303 Message-ID: 3304 From: Alice 3305 To: Bob 3306 Date: Sat, 20 Feb 2021 12:07:02 -0500 3308 --a23 3309 MIME-Version: 1.0 3310 Subject: smime-multipart-complex-injected 3311 Message-ID: 3312 From: Alice 3313 To: Bob 3314 Date: Sat, 20 Feb 2021 12:07:02 -0500 3315 Content-Type: multipart/mixed; boundary="d03"; protected-headers="v1" 3317 --d03 3318 MIME-Version: 1.0 3319 Content-Type: multipart/alternative; boundary="8d8" 3321 --8d8 3322 Content-Type: text/plain; charset="us-ascii" 3323 MIME-Version: 1.0 3324 Content-Transfer-Encoding: 7bit 3326 This is the smime-multipart-complex-injected message. 3328 This is a signed-only S/MIME message via PKCS#7 detached signature 3329 (multipart/signed). The payload is a multipart/alternative message 3330 with an inline image/png attachment. It uses the Injected Headers 3331 header protection scheme. 3333 -- 3334 Alice 3335 alice@smime.example 3336 --8d8 3337 Content-Type: text/html; charset="us-ascii" 3338 MIME-Version: 1.0 3339 Content-Transfer-Encoding: 7bit 3341 3342

This is the smime-multipart-complex-injected message.

3343

This is a signed-only S/MIME message via PKCS#7 detached signature 3344 (multipart/signed). The payload is a multipart/alternative message 3345 with an inline image/png attachment. It uses the Injected Headers 3346 header protection scheme.

3347

--
Alice
alice@smime.example

3348 --8d8-- 3350 --d03 3351 Content-Type: image/png 3352 Content-Transfer-Encoding: base64 3353 Content-Disposition: inline 3355 iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAcElEQVR42uVTOxbA 3356 MAgS739nO3TpRw20dqpbfARQEjOywiwYnCtkDKnbcLk66sqlT+zt9cidkE+6KwkZ 3357 sgrzfcqVMpL2jo0447gYDpeArk+OnJHkIhAfTPRicihAf5YJrw7vjv0ZWRWM/uli 3358 vdPf1QZ2kDD9xppd8wAAAABJRU5ErkJggg== 3360 --d03-- 3361 --a23 3362 Content-Transfer-Encoding: base64 3363 Content-Type: application/pkcs7-signature; name="smime.p7s" 3365 MIIJ4AYJKoZIhvcNAQcCoIIJ0TCCCc0CAQExDTALBglghkgBZQMEAgEwCwYJKoZI 3366 hvcNAQcBoIIHpjCCA88wggK3oAMCAQICEw8tJb0ROZdKzkJUh6HuPTQGirQwDQYJ 3367 KoZIhvcNAQENBQAwVTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cx 3368 MTAvBgNVBAMTKFNhbXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3Jp 3369 dHkwIBcNMTkxMTIwMDY1NDE4WhgPMjA1MjA5MjcwNjU0MThaMDsxDTALBgNVBAoT 3370 BElFVEYxETAPBgNVBAsTCExBTVBTIFdHMRcwFQYDVQQDEw5BbGljZSBMb3ZlbGFj 3371 ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJqVKfqLwaLjj+gBUCfk 3372 acKTg8cc2OtJ9ZSed6U3jUoiZVpMLcP3MUKtLeLg9r1mAfIDlB/wlbdmadXPmrsz 3373 yidmbuZmOpB5voVQfiLYYy3iOx7YOqzXrl6udP07k0sV+UdSNRFxrfKeoQEFXgOa 3374 Gdmnx4OG/e3p1fIKM0dPzZLoOAJF5m5O0xzXPL74zFCWp2f1ZkuE4A6l41koaZXC 3375 N5XL7wWTLMLeNf9Byb5ksKqUuqEHAMd1nmoNMgjY9VfVfcrv9w43GG8FtpSX+TWz 3376 B2zNS2OF+XIVnzRG5DeoULq8v88Z5bLpIJ/nx26r8A4SSwIBaVv4wPxAf1iPsIVK 3377 arUCAwEAAaOBrzCBrDAMBgNVHRMBAf8EAjAAMBcGA1UdIAQQMA4wDAYKYIZIAWUD 3378 AgEwATAeBgNVHREEFzAVgRNhbGljZUBzbWltZS5leGFtcGxlMBMGA1UdJQQMMAoG 3379 CCsGAQUFBwMEMA4GA1UdDwEB/wQEAwIFIDAdBgNVHQ4EFgQUolNB1UQ8gCkVfAEj 3380 8OeOr83zdw8wHwYDVR0jBBgwFoAUkTCOfAcXDKfxCShlNhpnHGh29FkwDQYJKoZI 3381 hvcNAQENBQADggEBAIFJeKCcsTKcFqQMpTryujRGzJdYA+R9eBAuDLsatbtKtl4F 3382 zkgRyOg31/+Cw7H8e30iLrPIFlWN1qjHrjgOyIs5AQ/hgxLvLir3hEUV2Z3MRsMt 3383 jH2x9SG91PEM046gfPnc9gMGHjMTg1qvaKcLQP5UzpEYPLror2X4P5uXxaP0LIZR 3384 zWmkw1RF7FOD7PfB5v94M5274XYxW2W4uKGd7QGnUZROSvSYkGiWDp1JhqXwfDz8 3385 A0enITGXnoEkAFvvjiCqh64P1hIeMorj36pgL19oWZD6YrzSWHUz1F00juyuOfQs 3386 qm6hvrDTqNpHNZ015fOURza1SkCvi9GFmNUPoVgwggPPMIICt6ADAgECAhM3QQV5 3387 7XV/QqmiXDr0+GrOmqnXMA0GCSqGSIb3DQEBDQUAMFUxDTALBgNVBAoTBElFVEYx 3388 ETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFNUFMgUlNBIENl 3389 cnRpZmljYXRpb24gQXV0aG9yaXR5MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3 3390 MDY1NDE4WjA7MQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBXRzEXMBUG 3391 A1UEAxMOQWxpY2UgTG92ZWxhY2UwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK 3392 AoIBAQC09InoWDgWPk2af0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHU 3393 a4xQUl5JO6VqY18LANwORjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz 3394 /evPgP96wV+z4TtAwW2Z34rTiz4DxMI07XYNFUEOls/gkUP2GxzymsO2kaYWTut3 3395 SryCqeHEFbZFkB4urMk4xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQ 3396 saqpo1d3f9jSkbtAV5w3vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgE 3397 ykRiVokFQgqQ7XNDU+r3SeOWwks7AgMBAAGjga8wgawwDAYDVR0TAQH/BAIwADAX 3398 BgNVHSAEEDAOMAwGCmCGSAFlAwIBMAEwHgYDVR0RBBcwFYETYWxpY2VAc21pbWUu 3399 ZXhhbXBsZTATBgNVHSUEDDAKBggrBgEFBQcDBDAOBgNVHQ8BAf8EBAMCBsAwHQYD 3400 VR0OBBYEFLv2zLItHQYSHJeuKWqQENMgZmZzMB8GA1UdIwQYMBaAFJEwjnwHFwyn 3401 8QkoZTYaZxxodvRZMA0GCSqGSIb3DQEBDQUAA4IBAQBziaI2p86poGkjd/4KkkOH 3402 G25nY/0eNARD6/oF0/sYonX2doizcGMk53riugAocCn5zbzhW/JVdYn30UxfyrZl 3403 RAzEf7GHqgB/NyjOad3pdpVYeDh4ciNKjbs+aEoTWgAkoqENt1sRxlcvb7HVX524 3404 bKZa1oPTUNlm6QpivtqDIdqGJdGf8L1zLfXBuo2zL3HR+M9CDr4Opq2JCkzP0Qhp 3405 7poIccGE6I9Tsg+RrOA9iCQsPn1+Tg8YedjGzUWF07rNmT0TzPCVzUAuBlr+JJtz 3406 OKypyQ3eoZ6EPazXqMyHAVcsm0GI364IOA0b8PSrJNtjh+AqJ5QfH+0e7NSzNnEm 3407 MYICADCCAfwCAQEwbDBVMQ0wCwYDVQQKEwRJRVRGMREwDwYDVQQLEwhMQU1QUyBX 3408 RzExMC8GA1UEAxMoU2FtcGxlIExBTVBTIFJTQSBDZXJ0aWZpY2F0aW9uIEF1dGhv 3409 cml0eQITN0EFee11f0Kpolw69Phqzpqp1zALBglghkgBZQMEAgGgaTAYBgkqhkiG 3410 9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0yMTAyMjAxNzA3MDJa 3411 MC8GCSqGSIb3DQEJBDEiBCA4lKOx9a084fB6gb7XvsxC6U70hVOXe3FjeF9sS6mN 3412 qDANBgkqhkiG9w0BAQEFAASCAQAfMFJgqp9Vb8dS34Kz4fZfKGA1SMbqun/XqC6S 3413 9/+EpIiDL54Mw3qug01eU/ms0YoBlu8aV/9CbC2DlOdPrFCRuHTWyFClWgi2X5Mj 3414 fg57SXgGd1KJmhWAtcNuI11l1k6TeoI/pmU/R9tNKrF349tDVHZU/4GWUfuyiorK 3415 t6TQK0/Vf+JUySQVCUqnx+Zb+bhvWmKfKuX0CJDEOyD+kH21ar0HMNGLK9S9R3MJ 3416 dfL9+1PmXCXsTP7TIhmnwCJSpBJpmzzq345uu3N52/3SsJYrahIUkbPLnYxTAKDD 3417 N1k0ijGbEofDEC9RtdwnoGPfv1UG95LK22Ys3tLqApQqkByY 3419 --a23-- 3421 A.3. Encrypted-and-signed Messages 3423 These messages are encrypted and signed. They use PKCS#7 signedData 3424 inside envelopedData, with different header protection schemes and 3425 different Header Confidentiality Policies. 3427 A.3.1. S/MIME encrypted and signed over a simple message, Wrapped 3428 Message with hcp_minimal 3430 This is a encrypted and signed S/MIME message using PKCS#7 3431 envelopedData around signedData. The payload is a text/plain 3432 message. It uses the Wrapped Message header protection scheme with 3433 the hcp_minimal Header Confidentiality Policy. 3435 It has the following structure: 3437 └─╴application/pkcs7-mime [smime.p7m] 7345 bytes 3438 ↧ (decrypts to) 3439 └─╴application/pkcs7-mime [smime.p7m] 4436 bytes 3440 ⇩ (unwraps to) 3441 └┬╴message/rfc822 679 bytes 3442 └─╴text/plain 321 bytes 3444 Its contents are: 3446 Content-Transfer-Encoding: base64 3447 Content-Type: application/pkcs7-mime; name="smime.p7m"; 3448 smime-type="enveloped-data" 3449 Subject: [...] 3450 Message-ID: 3451 From: Alice 3452 To: Bob 3453 Date: Sat, 20 Feb 2021 10:08:02 -0500 3455 MIIVLAYJKoZIhvcNAQcDoIIVHTCCFRkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 3456 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 3457 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 3458 Boq0MA0GCSqGSIb3DQEBAQUABIIBAFHb+aM8bhyJ1nFFuBDyyBVQf2IplykrvvYb 3459 mKqBk08i2gecPSOMTkW5e2oQ4+WT4rtU4E0JXfMSA2KukKc+QUA3ycVCoL5zhetX 3460 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S/MIME encrypted and signed over a simple message, Injected 3570 Headers with hcp_minimal 3572 This is a encrypted and signed S/MIME message using PKCS#7 3573 envelopedData around signedData. The payload is a text/plain 3574 message. It uses the Injected Headers header protection scheme with 3575 the hcp_minimal Header Confidentiality Policy. 3577 It has the following structure: 3579 └─╴application/pkcs7-mime [smime.p7m] 7305 bytes 3580 ↧ (decrypts to) 3581 └─╴application/pkcs7-mime [smime.p7m] 4406 bytes 3582 ⇩ (unwraps to) 3583 └─╴text/plain 333 bytes 3585 Its contents are: 3587 Content-Transfer-Encoding: base64 3588 Content-Type: application/pkcs7-mime; name="smime.p7m"; 3589 smime-type="enveloped-data" 3590 Subject: [...] 3591 Message-ID: 3592 From: Alice 3593 To: Bob 3594 Date: Sat, 20 Feb 2021 10:09:02 -0500 3596 MIIVDAYJKoZIhvcNAQcDoIIU/TCCFPkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 3597 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 3598 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 3599 Boq0MA0GCSqGSIb3DQEBAQUABIIBAEqWQtP9NMp0lborDI5F55uEoZxerbw2f8G8 3600 04jr822TF4ehQnzqtlSmtb3q7XZZGz3OVYv0JOO2DWrWWbSzaaWHXwJ8HdM0vxiO 3601 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S/MIME encrypted and signed over a simple message, Injected 3711 Headers with hcp_minimal (+ Legacy Display) 3713 This is a encrypted and signed S/MIME message using PKCS#7 3714 envelopedData around signedData. The payload is a text/plain 3715 message. It uses the Injected Headers header protection scheme with 3716 the hcp_minimal Header Confidentiality Policy with a "Legacy Display" 3717 part. 3719 It has the following structure: 3721 └─╴application/pkcs7-mime [smime.p7m] 7865 bytes 3722 ↧ (decrypts to) 3723 └─╴application/pkcs7-mime [smime.p7m] 4810 bytes 3724 ⇩ (unwraps to) 3725 └┬╴multipart/mixed 923 bytes 3726 ├─╴text/plain 51 bytes 3727 └─╴text/plain 370 bytes 3729 Its contents are: 3731 Content-Transfer-Encoding: base64 3732 Content-Type: application/pkcs7-mime; name="smime.p7m"; 3733 smime-type="enveloped-data" 3734 Subject: [...] 3735 Message-ID: 3736 3737 From: Alice 3738 To: Bob 3739 Date: Sat, 20 Feb 2021 10:10:02 -0500 3741 MIIWrAYJKoZIhvcNAQcDoIIWnTCCFpkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 3742 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 3743 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 3744 Boq0MA0GCSqGSIb3DQEBAQUABIIBAEa22w/F1c0bIG8WvzjmjX22NFNUPhwFe1V/ 3745 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S/MIME encrypted and signed over a simple message, Wrapped 3864 Message with hcp_strong 3866 This is a encrypted and signed S/MIME message using PKCS#7 3867 envelopedData around signedData. The payload is a text/plain 3868 message. It uses the Wrapped Message header protection scheme with 3869 the hcp_strong Header Confidentiality Policy. 3871 It has the following structure: 3873 └─╴application/pkcs7-mime [smime.p7m] 7345 bytes 3874 ↧ (decrypts to) 3875 └─╴application/pkcs7-mime [smime.p7m] 4432 bytes 3876 ⇩ (unwraps to) 3877 └┬╴message/rfc822 675 bytes 3878 └─╴text/plain 319 bytes 3880 Its contents are: 3882 Content-Transfer-Encoding: base64 3883 Content-Type: application/pkcs7-mime; name="smime.p7m"; 3884 smime-type="enveloped-data" 3885 Subject: [...] 3886 Message-ID: <73a42f8e-8f5a-5c62-b982-82ace766fd32@lhp.example> 3887 From: Alice 3888 To: Bob 3889 Date: Sat, 20 Feb 2021 10:11:02 -0500 3891 MIIVLAYJKoZIhvcNAQcDoIIVHTCCFRkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 3892 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 3893 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 3894 Boq0MA0GCSqGSIb3DQEBAQUABIIBAHMG7sjRDCJDMqgvQrFh4sk9MkaJJY7q6B3r 3895 hY87n3jM6UYk/ZaBi9uzcB1pDAF0hJkFLmo+PRUbFLUrmeYfQI6OuvVElpwIDWMp 3896 cMtfzlXgKAO6fh/On6aoVhpfv9EmaG1rCU5ezDPPbaXW8caNi2/yvL0ustpqKOTj 3897 cOLgMK45tPcHeIaSD+8A4P0uf/GLzEFhDPdJrt3mVq76UbAoIGasA/sDhhg0xygq 3898 ZH3IPQoYShFEUmsK+RC9Sc9dmXtVYPByCEsPdhTieJyjW695dde8xl7ZeWS+JZai 3899 QK8pXZUdRL8El82+001HTXZYybfF05sFmJHQZ3LlftF2Dqs800cwggGEAgEAMGww 3900 VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh 3901 bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 3902 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEALvjSc3y8/+aA+Mk2+8tupO51 3903 fsr8cR8BV0+aR/CYDXaeAFg6CPk12PnLcpFRZDdqitxfe7SpMgk0oT3IsBxvuOsr 3904 0QckRlRLOwlv43Y9jJFMc7VInrB7bJ/cPHHgB07tPtB69/Qf252gsUs3UbWko8JU 3905 JXBkymfUAe5+x8/gGQYNJdvNC+v9cmnwTORFF/IJ/WcGsyHPhxguR+JZqIJkSI8T 3906 xjawV40qcahz5G/O3vLI8kxW96lSSmVE9WIuPafsMbP1KZN/6i1gaUOPFcsH1jln 3907 fdnk3fToayCGwOAQvh/UYvlGTA06Rtnmz44YLZiGbVLFLGlvcXFfwL1JLdl25DCC 3908 Ef4GCSqGSIb3DQEHATAdBglghkgBZQMEAQIEEJo6kOdMHnCo9aCxhG8k8qSAghHQ 3909 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r3I2871gQAni/LsF8CEAPaXE6swdSsfc0GWTi5W+jnDh2oeAWeUOqb10+vwLikC+ 3994 Xm4VabpnHPZPiozLRL6TaVEqvmBpvUXgZffUIXpXHsWbVpJuPsIzMlmgeKEdwUvD 3995 Efcmnds0p3V5B4ZaXLfR6aHdtrDT+B8eNb1bB2wOP/IA7Up4NzVf9BtEzq2JKj18 3996 mtSbNmSuhSGqYP3fKWV4inAgRQiDDw3bnazMh/mI17qMLa25lzP9IJ5RNDRRWCjf 3997 +mljnLpyYHb5RyZ4nqD4+w59YM9Q/v72C2cyL6WygYE4JVXIWdnrHPSTkjBBjoxD 3998 P1WbthMP6DJcM5v9t8Rv8Mc8bPiUrKzMDCbXNcPJm1HDCnYrWXFYqOvUpKvWn6zt 3999 Q39rPppCdrHkNzFS20MsvWiw9KsWg2rb/ph+qh418ac8VdyXNcETVgkLeYHnue61 4000 Rbb04HvCvu3bBNjy8D6yRlFVIVxH3Zy7+iz3fJ70VwlqqpmlnMsidx3v1ykAeK1t 4001 uo42n/3t82Dx/5s3p9rZnhWXUdO0etjL88GpyzvdwtkYy3Nj/8afvB62iUwZ1fR5 4002 rcnklWkphSq9HL6brXQsS3lODDHsy8xIJlu5RrGD2MOIOy/rbMxNT5WnGoZ6j/RJ 4003 Spn1f944h2LkyVFFNgIlq1W6MLfTNBrZZ6kMpJ8X39iL5KmkrQ1me1rgJTtM4heK 4005 A.3.5. S/MIME encrypted and signed over a simple message, Injected 4006 Headers with hcp_strong 4008 This is a encrypted and signed S/MIME message using PKCS#7 4009 envelopedData around signedData. The payload is a text/plain 4010 message. It uses the Injected Headers header protection scheme with 4011 the hcp_strong Header Confidentiality Policy. 4013 It has the following structure: 4015 └─╴application/pkcs7-mime [smime.p7m] 7305 bytes 4016 ↧ (decrypts to) 4017 └─╴application/pkcs7-mime [smime.p7m] 4402 bytes 4018 ⇩ (unwraps to) 4019 └─╴text/plain 331 bytes 4021 Its contents are: 4023 Content-Transfer-Encoding: base64 4024 Content-Type: application/pkcs7-mime; name="smime.p7m"; 4025 smime-type="enveloped-data" 4026 Subject: [...] 4027 Message-ID: <27139e00-e05f-581d-a339-d2bd43bd0f42@lhp.example> 4028 From: Alice 4029 To: Bob 4030 Date: Sat, 20 Feb 2021 10:12:02 -0500 4032 MIIVDAYJKoZIhvcNAQcDoIIU/TCCFPkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 4033 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 4034 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 4035 Boq0MA0GCSqGSIb3DQEBAQUABIIBAFeMxt6IIoOR5Kq2Jiucu85qezrNEQcYm6sV 4036 Cuo2f+/3QCmr85ho7PNGXSmj0LkmkvIAh4RYf2fH6jqYSYgsxQjT3jOcx70hhTms 4037 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dNXwFG6OepZTs+r3yLEpqH82vnbak35zhJTZgWWlUutcLLYLuulaTv85TntCV5du 4136 tEPiR2f6oxgo+96zUxxpFAMU6+EZz01IeGYy61+NTJ0aAOhWvlmpff2uDBEJtdnu 4137 /i7WYT5qC6Pae0ZWIhseLGI1U/CUMfdY295pCfCQSTS8O16J93yHY5bWMwMyDw52 4138 Vf584mGeE3a5/j9ju9qnjdl7Z5rjR7bc7oYKjCP+Pv+R3pOo7jhNhTKCbipvH2Ik 4139 xi+aa9nsTlYgNFMTmbFljhcsiTbPSOw6NpNfJmynWlduqM2Ra5ZSMOjdKtOEW5mL 4140 HKN7LhzMs5nWvxM2m6J26kzfbM3+d5W361BvgU6v9oCE8uSobGI/sSNP0kgGU9Cx 4141 A9kSrxMnhahtlC02aROS08PSeAcErUnyKJLOdrcACRM/T6iwROLI38Nn3E/PuqmF 4142 XDcN6aosfk5Gz0WhEuIe7o4bEDcHTKkeZ90/qNyJuCTwh99VUEeN9T6PovTSTYr2 4143 xpl2Dca+KXzEcdmT6bL3eyrBAMRW8HyfYTxAJntty0pLOgszHc9Im6q5Y+HvKOU2 4144 Jck3h1nygfBehDUwsLTWPg== 4146 A.3.6. S/MIME encrypted and signed over a simple message, Injected 4147 Headers with hcp_strong (+ Legacy Display) 4149 This is a encrypted and signed S/MIME message using PKCS#7 4150 envelopedData around signedData. The payload is a text/plain 4151 message. It uses the Injected Headers header protection scheme with 4152 the hcp_strong Header Confidentiality Policy with a "Legacy Display" 4153 part. 4155 It has the following structure: 4157 └─╴application/pkcs7-mime [smime.p7m] 7845 bytes 4158 ↧ (decrypts to) 4159 └─╴application/pkcs7-mime [smime.p7m] 4802 bytes 4160 ⇩ (unwraps to) 4161 └┬╴multipart/mixed 918 bytes 4162 ├─╴text/plain 50 bytes 4163 └─╴text/plain 367 bytes 4165 Its contents are: 4167 Content-Transfer-Encoding: base64 4168 Content-Type: application/pkcs7-mime; name="smime.p7m"; 4169 smime-type="enveloped-data" 4170 Subject: [...] 4171 Message-ID: <73a42f8e-8f5a-5c62-b982-82ace766fd32@lhp.example> 4172 From: Alice 4173 To: Bob 4174 Date: Sat, 20 Feb 2021 10:13:02 -0500 4176 MIIWnAYJKoZIhvcNAQcDoIIWjTCCFokCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 4177 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 4178 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 4179 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S/MIME encrypted and signed reply over a simple message, Wrapped 4299 Message with hcp_minimal 4301 This is a encrypted and signed S/MIME message using PKCS#7 4302 envelopedData around signedData. The payload is a text/plain 4303 message. It uses the Wrapped Message header protection scheme with 4304 the hcp_minimal Header Confidentiality Policy. 4306 It has the following structure: 4308 └─╴application/pkcs7-mime [smime.p7m] 7605 bytes 4309 ↧ (decrypts to) 4310 └─╴application/pkcs7-mime [smime.p7m] 4626 bytes 4311 ⇩ (unwraps to) 4312 └┬╴message/rfc822 816 bytes 4313 └─╴text/plain 327 bytes 4315 Its contents are: 4317 Content-Transfer-Encoding: base64 4318 Content-Type: application/pkcs7-mime; name="smime.p7m"; 4319 smime-type="enveloped-data" 4320 Subject: [...] 4321 Message-ID: 4322 From: Alice 4323 To: Bob 4324 Date: Sat, 20 Feb 2021 10:14:02 -0500 4325 In-Reply-To: 4326 References: 4328 MIIV7AYJKoZIhvcNAQcDoIIV3TCCFdkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 4329 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 4330 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 4331 Boq0MA0GCSqGSIb3DQEBAQUABIIBAJG/Nu5fmnMkn1fBsCANbQMYLALsx0mJWEly 4332 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cJY2hGykCCDvfrTBjTuvIB5KeKgMfJRJDMtGAfzPESCXOZcDr4pXX4im1japeGUx 4446 A.3.8. S/MIME encrypted and signed reply over a simple message, 4447 Injected Headers with hcp_minimal 4449 This is a encrypted and signed S/MIME message using PKCS#7 4450 envelopedData around signedData. The payload is a text/plain 4451 message. It uses the Injected Headers header protection scheme with 4452 the hcp_minimal Header Confidentiality Policy. 4454 It has the following structure: 4456 └─╴application/pkcs7-mime [smime.p7m] 7585 bytes 4457 ↧ (decrypts to) 4458 └─╴application/pkcs7-mime [smime.p7m] 4600 bytes 4459 ⇩ (unwraps to) 4460 └─╴text/plain 339 bytes 4462 Its contents are: 4464 Content-Transfer-Encoding: base64 4465 Content-Type: application/pkcs7-mime; name="smime.p7m"; 4466 smime-type="enveloped-data" 4467 Subject: [...] 4468 Message-ID: 4469 4470 From: Alice 4471 To: Bob 4472 Date: Sat, 20 Feb 2021 10:15:02 -0500 4473 In-Reply-To: 4474 References: 4476 MIIV3AYJKoZIhvcNAQcDoIIVzTCCFckCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 4477 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 4478 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 4479 Boq0MA0GCSqGSIb3DQEBAQUABIIBABgRQRzXTRs0Jqxrl9ouqlyyOUVTZpzsEN4E 4480 rRGV0bKlOV1O8OiF4s73Oamfc1GowC6YOss5JBen3EQq5NmMsFXjlU5sSiFGgsX6 4481 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S/MIME encrypted and signed reply over a simple message, 4595 Injected Headers with hcp_minimal (+ Legacy Display) 4597 This is a encrypted and signed S/MIME message using PKCS#7 4598 envelopedData around signedData. The payload is a text/plain 4599 message. It uses the Injected Headers header protection scheme with 4600 the hcp_minimal Header Confidentiality Policy with a "Legacy Display" 4601 part. 4603 It has the following structure: 4605 └─╴application/pkcs7-mime [smime.p7m] 8170 bytes 4606 ↧ (decrypts to) 4607 └─╴application/pkcs7-mime [smime.p7m] 5034 bytes 4608 ⇩ (unwraps to) 4609 └┬╴multipart/mixed 1082 bytes 4610 ├─╴text/plain 57 bytes 4611 └─╴text/plain 376 bytes 4613 Its contents are: 4615 Content-Transfer-Encoding: base64 4616 Content-Type: application/pkcs7-mime; name="smime.p7m"; 4617 smime-type="enveloped-data" 4618 Subject: [...] 4619 Message-ID: 4620 4621 From: Alice 4622 To: Bob 4623 Date: Sat, 20 Feb 2021 10:16:02 -0500 4624 In-Reply-To: 4625 4626 References: 4627 4629 MIIXjAYJKoZIhvcNAQcDoIIXfTCCF3kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 4630 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 4631 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 4632 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S/MIME encrypted and signed reply over a simple message, 4757 Wrapped Message with hcp_strong 4759 This is a encrypted and signed S/MIME message using PKCS#7 4760 envelopedData around signedData. The payload is a text/plain 4761 message. It uses the Wrapped Message header protection scheme with 4762 the hcp_strong Header Confidentiality Policy. 4764 It has the following structure: 4766 └─╴application/pkcs7-mime [smime.p7m] 7605 bytes 4767 ↧ (decrypts to) 4768 └─╴application/pkcs7-mime [smime.p7m] 4616 bytes 4769 ⇩ (unwraps to) 4770 └┬╴message/rfc822 810 bytes 4771 └─╴text/plain 325 bytes 4773 Its contents are: 4775 Content-Transfer-Encoding: base64 4776 Content-Type: application/pkcs7-mime; name="smime.p7m"; 4777 smime-type="enveloped-data" 4778 Subject: [...] 4779 Message-ID: 4780 From: Alice 4781 To: Bob 4782 Date: Sat, 20 Feb 2021 10:17:02 -0500 4784 MIIV7AYJKoZIhvcNAQcDoIIV3TCCFdkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 4785 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 4786 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 4787 Boq0MA0GCSqGSIb3DQEBAQUABIIBAIEzSE7YJfWjy0TMQGEfYcrcBw2uruGZw+/k 4788 QaHXEcEFdwDSaKvAzEFoNN0xMpZ090ybC5MHqteYMRpaax43TsCnes6XevL7o7FV 4789 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S/MIME encrypted and signed reply over a simple message, 4903 Injected Headers with hcp_strong 4905 This is a encrypted and signed S/MIME message using PKCS#7 4906 envelopedData around signedData. The payload is a text/plain 4907 message. It uses the Injected Headers header protection scheme with 4908 the hcp_strong Header Confidentiality Policy. 4910 It has the following structure: 4912 └─╴application/pkcs7-mime [smime.p7m] 7565 bytes 4913 ↧ (decrypts to) 4914 └─╴application/pkcs7-mime [smime.p7m] 4592 bytes 4915 ⇩ (unwraps to) 4916 └─╴text/plain 337 bytes 4918 Its contents are: 4920 Content-Transfer-Encoding: base64 4921 Content-Type: application/pkcs7-mime; name="smime.p7m"; 4922 smime-type="enveloped-data" 4923 Subject: [...] 4924 Message-ID: <0e210732-9184-5855-9a95-2a635560d3a6@lhp.example> 4925 From: Alice 4926 To: Bob 4927 Date: Sat, 20 Feb 2021 10:18:02 -0500 4929 MIIVzAYJKoZIhvcNAQcDoIIVvTCCFbkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 4930 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 4931 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 4932 Boq0MA0GCSqGSIb3DQEBAQUABIIBAD2qfM1qd/wlIn5/weLGjTIvhLXq8DBtZlBx 4933 74LEO41mLd1hgnRYsPIWC2PtjkC/seobOuZC+CV58bybhtZc98t+SPFhw/rCzvKD 4934 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S/MIME encrypted and signed reply over a simple message, 5048 Injected Headers with hcp_strong (+ Legacy Display) 5050 This is a encrypted and signed S/MIME message using PKCS#7 5051 envelopedData around signedData. The payload is a text/plain 5052 message. It uses the Injected Headers header protection scheme with 5053 the hcp_strong Header Confidentiality Policy with a "Legacy Display" 5054 part. 5056 It has the following structure: 5058 └─╴application/pkcs7-mime [smime.p7m] 8150 bytes 5059 ↧ (decrypts to) 5060 └─╴application/pkcs7-mime [smime.p7m] 5022 bytes 5061 ⇩ (unwraps to) 5062 └┬╴multipart/mixed 1075 bytes 5063 ├─╴text/plain 56 bytes 5064 └─╴text/plain 373 bytes 5066 Its contents are: 5068 Content-Transfer-Encoding: base64 5069 Content-Type: application/pkcs7-mime; name="smime.p7m"; 5070 smime-type="enveloped-data" 5071 Subject: [...] 5072 Message-ID: <27139e00-e05f-581d-a339-d2bd43bd0f42@lhp.example> 5073 From: Alice 5074 To: Bob 5075 Date: Sat, 20 Feb 2021 10:19:02 -0500 5077 MIIXfAYJKoZIhvcNAQcDoIIXbTCCF2kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 5078 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 5079 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 5080 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S/MIME encrypted and signed over a complex message, Wrapped 5205 Message with hcp_minimal 5207 This is a encrypted and signed S/MIME message using PKCS#7 5208 envelopedData around signedData. The payload is a multipart/ 5209 alternative message with an inline image/png attachment. It uses the 5210 Wrapped Message header protection scheme with the hcp_minimal Header 5211 Confidentiality Policy. 5213 It has the following structure: 5215 └─╴application/pkcs7-mime [smime.p7m] 9450 bytes 5216 ↧ (decrypts to) 5217 └─╴application/pkcs7-mime [smime.p7m] 5982 bytes 5218 ⇩ (unwraps to) 5219 └┬╴message/rfc822 1805 bytes 5220 └┬╴multipart/mixed 1741 bytes 5221 ├┬╴multipart/alternative 1118 bytes 5222 │├─╴text/plain 375 bytes 5223 │└─╴text/html 459 bytes 5224 └─╴image/png inline 232 bytes 5226 Its contents are: 5228 Content-Transfer-Encoding: base64 5229 Content-Type: application/pkcs7-mime; name="smime.p7m"; 5230 smime-type="enveloped-data" 5231 Subject: [...] 5232 Message-ID: 5233 5234 From: Alice 5235 To: Bob 5236 Date: Sat, 20 Feb 2021 12:08:02 -0500 5238 MIIbPAYJKoZIhvcNAQcDoIIbLTCCGykCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 5239 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 5240 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 5241 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8et3eNsg5E/cAgzt0OJO/hpkQ0fL5k4dB6DTiJrwEMiedvp7cTeHPtlOdMa/KDge 5382 Mqk0daemNTOUbk3Vsj2s3SfS7BpDTnulb7/1U0Ti4oMF1Eerc7fb91dOhsKkh+13 5383 fRAIhT6rto+gbnDKGQffeQ== 5385 A.3.14. S/MIME encrypted and signed over a complex message, Injected 5386 Headers with hcp_minimal 5388 This is a encrypted and signed S/MIME message using PKCS#7 5389 envelopedData around signedData. The payload is a multipart/ 5390 alternative message with an inline image/png attachment. It uses the 5391 Injected Headers header protection scheme with the hcp_minimal Header 5392 Confidentiality Policy. 5394 It has the following structure: 5396 └─╴application/pkcs7-mime [smime.p7m] 9470 bytes 5397 ↧ (decrypts to) 5398 └─╴application/pkcs7-mime [smime.p7m] 6006 bytes 5399 ⇩ (unwraps to) 5400 └┬╴multipart/mixed 1771 bytes 5401 ├┬╴multipart/alternative 1122 bytes 5402 │├─╴text/plain 387 bytes 5403 │└─╴text/html 468 bytes 5404 └─╴image/png inline 236 bytes 5406 Its contents are: 5408 Content-Transfer-Encoding: base64 5409 Content-Type: application/pkcs7-mime; name="smime.p7m"; 5410 smime-type="enveloped-data" 5411 Subject: [...] 5412 Message-ID: 5413 5414 From: Alice 5415 To: Bob 5416 Date: Sat, 20 Feb 2021 12:09:02 -0500 5418 MIIbTAYJKoZIhvcNAQcDoIIbPTCCGzkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 5419 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 5420 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 5421 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d6HCmDdxtzdeUNcHF9XTJ/YGme8gsU0PJ1dPBsMPS0lBw2TXJAkHmY01meT8/r0v 5562 r2uYdPt44EwrLtWonChUe1LwMWeK0D4soADI2Gc+cGxt/CWTFRFbULZF4BRc+1N9 5563 xKgCvub2mwWSwCGP4tHGKWpAaoTX2b6uP5Kb7N7HDRE= 5565 A.3.15. S/MIME encrypted and signed over a complex message, Injected 5566 Headers with hcp_minimal (+ Legacy Display) 5568 This is a encrypted and signed S/MIME message using PKCS#7 5569 envelopedData around signedData. The payload is a multipart/ 5570 alternative message with an inline image/png attachment. It uses the 5571 Injected Headers header protection scheme with the hcp_minimal Header 5572 Confidentiality Policy with a "Legacy Display" part. 5574 It has the following structure: 5576 └─╴application/pkcs7-mime [smime.p7m] 10120 bytes 5577 ↧ (decrypts to) 5578 └─╴application/pkcs7-mime [smime.p7m] 6474 bytes 5579 ⇩ (unwraps to) 5580 └┬╴multipart/mixed 2095 bytes 5581 ├─╴text/plain 59 bytes 5582 └┬╴multipart/mixed 1600 bytes 5583 ├┬╴multipart/alternative 1194 bytes 5584 │├─╴text/plain 424 bytes 5585 │└─╴text/html 505 bytes 5586 └─╴image/png inline 236 bytes 5588 Its contents are: 5590 Content-Transfer-Encoding: base64 5591 Content-Type: application/pkcs7-mime; name="smime.p7m"; 5592 smime-type="enveloped-data" 5593 Subject: [...] 5594 Message-ID: 5595 5596 From: Alice 5597 To: Bob 5598 Date: Sat, 20 Feb 2021 12:10:02 -0500 5600 MIIdLAYJKoZIhvcNAQcDoIIdHTCCHRkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 5601 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 5602 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S/MIME encrypted and signed over a complex message, Wrapped 5758 Message with hcp_strong 5760 This is a encrypted and signed S/MIME message using PKCS#7 5761 envelopedData around signedData. The payload is a multipart/ 5762 alternative message with an inline image/png attachment. It uses the 5763 Wrapped Message header protection scheme with the hcp_strong Header 5764 Confidentiality Policy. 5766 It has the following structure: 5768 └─╴application/pkcs7-mime [smime.p7m] 9425 bytes 5769 ↧ (decrypts to) 5770 └─╴application/pkcs7-mime [smime.p7m] 5974 bytes 5771 ⇩ (unwraps to) 5772 └┬╴message/rfc822 1799 bytes 5773 └┬╴multipart/mixed 1735 bytes 5774 ├┬╴multipart/alternative 1114 bytes 5775 │├─╴text/plain 373 bytes 5776 │└─╴text/html 457 bytes 5777 └─╴image/png inline 232 bytes 5779 Its contents are: 5781 Content-Transfer-Encoding: base64 5782 Content-Type: application/pkcs7-mime; name="smime.p7m"; 5783 smime-type="enveloped-data" 5784 Subject: [...] 5785 Message-ID: <0b3ea6dd-0e91-5a91-9bc0-3d553f892983@lhp.example> 5786 From: Alice 5787 To: Bob 5788 Date: Sat, 20 Feb 2021 12:11:02 -0500 5790 MIIbLAYJKoZIhvcNAQcDoIIbHTCCGxkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 5791 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 5792 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rLxSXEp59N+Onc48lbgEpcpN3Z0Cf+bOPYIODGfLwRorwoqJpG+cv4UJQfj2ZX9A 5933 bhBfC4dD0ZlqMAhBjK1zvfDDjafmY/5CD3xfTqPDxKTDjW/UVShgxuLn/Ida0NAA 5934 pAcZk4SNuLYBM4uG+YEl6ddJfuzndZgKOb4MbCPu34rRIF9AWBNu8P1Gca5dlzuK 5936 A.3.17. S/MIME encrypted and signed over a complex message, Injected 5937 Headers with hcp_strong 5939 This is a encrypted and signed S/MIME message using PKCS#7 5940 envelopedData around signedData. The payload is a multipart/ 5941 alternative message with an inline image/png attachment. It uses the 5942 Injected Headers header protection scheme with the hcp_strong Header 5943 Confidentiality Policy. 5945 It has the following structure: 5947 └─╴application/pkcs7-mime [smime.p7m] 9470 bytes 5948 ↧ (decrypts to) 5949 └─╴application/pkcs7-mime [smime.p7m] 5998 bytes 5950 ⇩ (unwraps to) 5951 └┬╴multipart/mixed 1765 bytes 5952 ├┬╴multipart/alternative 1118 bytes 5953 │├─╴text/plain 385 bytes 5954 │└─╴text/html 466 bytes 5955 └─╴image/png inline 236 bytes 5957 Its contents are: 5959 Content-Transfer-Encoding: base64 5960 Content-Type: application/pkcs7-mime; name="smime.p7m"; 5961 smime-type="enveloped-data" 5962 Subject: [...] 5963 Message-ID: 5964 From: Alice 5965 To: Bob 5966 Date: Sat, 20 Feb 2021 12:12:02 -0500 5968 MIIbTAYJKoZIhvcNAQcDoIIbPTCCGzkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 5969 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 5970 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 5971 Boq0MA0GCSqGSIb3DQEBAQUABIIBACg5SAEbJdRyrU8Bf5P1nTcvjMySeblcbXsC 5972 SPaTgaVlplQQBJ8FmEBqzqelnX/JRwlJblVRu3LpDq0jaXSvJOnU0G9n1uuVbwIO 5973 g2rKZmzj1nR3GUfnvVip5f7hfxCXtdIkTW2nxYrhrlMuOCSn8vhIg1vaZNKflzwl 5974 B7xn5F94g+SJwnxyOi66u35/A9fzexPN2CziSG9z2UAf6L+PV/AUSM13NnnFCNxP 5975 WwbnG9DqAOuCPVXq+W8Y93CvFjG4p4UP+6PLTeLcciFe60QKqeZoeE57xBzferxu 5976 u3HOrMm1m6nLHXXzayGx2PPfC9rGZqHBdS6EeuMd50SchpyVeNAwggGEAgEAMGww 5977 VTENMAsGA1UEChMESUVURjERMA8GA1UECxMITEFNUFMgV0cxMTAvBgNVBAMTKFNh 5978 bXBsZSBMQU1QUyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkCEzB8R0APhiY6 5979 HGLS64MvlsDXhpQwDQYJKoZIhvcNAQEBBQAEggEAQIKKinEhs2gGBlkr4wmROMLj 5980 J5BtZ9ui0KT3QP47qn7cy9N18l7BK3yBTmqx3Lrw+Zb0Efyk6Hf5uP7PYj0wdET6 5981 smbGw9rmBbRIsTxqu/Jpu0jUEwPperuRFfSOU+2h9CkXlbCY9ZnntltaGVKJxFCF 5982 myXpOYFf5MfVyG6+Z4WljpR9JeiI57DTAPbD/+2LEedm0z/lvhDN/QSCZLDIe0Jo 5983 vOfS5CvzHmLHyPtUbdHxJ71NMQvbkQhu0dZFbxtFUypWTFk+X84PSCZQt5/NvrKB 5984 W7+SEzylc/Jbnp3je5M7bd+XjgBdhblYEO2CNw4EwnQxEtLhD+JNn9wzeelrJjCC 5985 GB4GCSqGSIb3DQEHATAdBglghkgBZQMEAQIEEJyJ4Y4LdbBu1BDaj40MuPmAghfw 5986 BPr3MdKD9K8S+bENae4nFDCZSuX/TxLyWxeCErUi452NWR4++LedhDvwMIO9OQPI 5987 zEzvs/1974yrRPhTfXtls8uyKS2MArtXEP+SwkqmF/sI60Miko1wrYZMm/ccCSor 5988 G45CdWIfCZmRaFJ+sui9+Uoe9aUw8gFtDE+4J7smDXWo/slu8mBcjbe+ncGk6ahx 5989 4607LxUagIoUT2ynLRV4N7Ex2uQ/NF/geMAqmAyYhD4mjjWC/WmIDVuQt+j1tZzR 5990 hUiADCdmR1qtynmG+cNu0RIa04lBw7NQSYZoI6ysnYKyH2e4F7cT42LdcHsiVrPQ 5991 sgiSG6zyh+pk+Va27L2Ou788dSg+yZ0MvZn129vPksqn1z5Ep22JQh5WKKX1f0mT 5992 U2lJbn+4AMGQPMzo1dVFydx5HFfV7cbhY5spO9uTV/IZPJOogOaZkNtLM8MMJDJy 5993 AOWO2iNyFJ5qQUCgK3gHwAe0kwsX9eIKaoCK0m4VeK5a3JLI0ktQduEw8y29asp9 5994 33CDvr/u2qpNe29ouO7rw0G4K61uA1w9DKUxuSOCPVYocazFKd4zsdlSXgHmKwuW 5995 GGdYGTvfLD/+ZWSbXWwRXIj40cPzbyHgIRLWOGxkEeBRyHnKp/wdX4QdpwOVXItj 5996 +fxqvCYc8iKEz/993R1FdGtUG7StJm0gCfOjU4DWnYJhNBSNfv/rkUd5bQtmUpHI 5997 HxxG7nC1EC3MQdGlZXSghfj2PKVDW6mFU6p2ExpsRkIOJ0RZRrhJuWXsNZvcNKFn 5998 05GrZzjKiCI199cyY5yJ6hUMl4rinVtr2YEibH5LTTHJAVX1ihv3pS6x1mFsWHXV 5999 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WUFpDbjRb676ynX7UEj0AzyYjrUU8hAzPBvcQkndrjeYSWaKkE4DHn3bbH7wAhRg 6098 AOhQqXFMIbOnyC5e0NWsIYn9nab+PlY7HUGjmWtW8XSheJkBh6Wf0aaO90OHTrq9 6099 ZLJ6XZkwtuh5pNUGYdjSrjmVcEPwin14wieGfJXkCbmBsZ8kJXR+eaQBR3qadKcR 6100 Cfn8kAC4efD761OJk2HvzjNZaIqvdNVekvJyGMiTWfhHpuZjQ0fcJC5NDbmwCdNY 6101 Qz7iS4YWdbXg10JNag32tazuhNwUegZFGXL9a5gcNkv7AdmWGkSdt0lsSPV05kfC 6102 QurrTtShb3hfJkR6KnVBSK3jFjcF5asLM/VxoQ/iBgaanPhen0fNWgkyJJaVmDJi 6103 4xzAhz9r6kPENqyCY5C+e62MvEaekDidg0gZUWuo/gdb6moIoBrCqZr4J9y4W2Tt 6104 6AZQtChAdW/A4OqDgXlXmXc/tXMy65zIccDzc/JMzufzQcP4wC7DbYC+sg/bNvv7 6105 LWWT4esu7njEbX7Ni4zIjhBlynqL+qecT5kB8ipGeql6+Js2iKNsi1HYQ+hTt4Xz 6106 k/sEobzFVLp6yWNpa0ZqyY7RTLcb3OJUM+KCgSftZd6FWi7M1cPn7PUWG+Hdof/R 6107 dxOt/PaXDxNYEK9yrcVWP4yurQ1YS+0oXzpmuAMQIbWvQki+tr0JcpsKnUxcvvsH 6108 ZFxZ02bTi73DCFCSWK00j8j5IVbvrRBvtgkVOAl4c5WU34sh6nwJPPBTeO002wFE 6109 VgO2F6dPTTys/6D9eOzd3yb3aEJ9PNFhpzY4uhS3TBWhEcuyJlpus8ximdQjwjlQ 6110 IgvT1ty1v2SRJLA8gVY8cmR6yn6KEL2lc2PsclF6zjYZd6khKSyrBBu7ZceIo78Q 6111 bnPly68qrr8l7x/DxYHFJ6pwZ8LYPg8XkZb4k3TmLZrA4ys3a81R5RKHkwmc9qAI 6112 kyNSd6lJLMeD2IMC7rxCupV/dIJZ2cIjH/46ZTOTB4jADtrHN1SjeFWOqnHhjKr+ 6113 naZLCDk2EcSquYtna4J4BvyQXdcebEz8/zSNK6jS1v8= 6115 A.3.18. S/MIME encrypted and signed over a complex message, Injected 6116 Headers with hcp_strong (+ Legacy Display) 6118 This is a encrypted and signed S/MIME message using PKCS#7 6119 envelopedData around signedData. The payload is a multipart/ 6120 alternative message with an inline image/png attachment. It uses the 6121 Injected Headers header protection scheme with the hcp_strong Header 6122 Confidentiality Policy with a "Legacy Display" part. 6124 It has the following structure: 6126 └─╴application/pkcs7-mime [smime.p7m] 10100 bytes 6127 ↧ (decrypts to) 6128 └─╴application/pkcs7-mime [smime.p7m] 6460 bytes 6129 ⇩ (unwraps to) 6130 └┬╴multipart/mixed 2088 bytes 6131 ├─╴text/plain 58 bytes 6132 └┬╴multipart/mixed 1596 bytes 6133 ├┬╴multipart/alternative 1190 bytes 6134 │├─╴text/plain 421 bytes 6135 │└─╴text/html 502 bytes 6136 └─╴image/png inline 236 bytes 6138 Its contents are: 6140 Content-Transfer-Encoding: base64 6141 Content-Type: application/pkcs7-mime; name="smime.p7m"; 6142 smime-type="enveloped-data" 6143 Subject: [...] 6144 Message-ID: 6145 From: Alice 6146 To: Bob 6147 Date: Sat, 20 Feb 2021 12:13:02 -0500 6149 MIIdHAYJKoZIhvcNAQcDoIIdDTCCHQkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 6150 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 6151 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S/MIME encrypted and signed reply over a complex message, 6307 Wrapped Message with hcp_minimal 6309 This is a encrypted and signed S/MIME message using PKCS#7 6310 envelopedData around signedData. The payload is a multipart/ 6311 alternative message with an inline image/png attachment. It uses the 6312 Wrapped Message header protection scheme with the hcp_minimal Header 6313 Confidentiality Policy. 6315 It has the following structure: 6317 └─╴application/pkcs7-mime [smime.p7m] 9750 bytes 6318 ↧ (decrypts to) 6319 └─╴application/pkcs7-mime [smime.p7m] 6200 bytes 6320 ⇩ (unwraps to) 6321 └┬╴message/rfc822 1964 bytes 6322 └┬╴multipart/mixed 1900 bytes 6323 ├┬╴multipart/alternative 1130 bytes 6324 │├─╴text/plain 381 bytes 6325 │└─╴text/html 465 bytes 6326 └─╴image/png inline 232 bytes 6328 Its contents are: 6330 Content-Transfer-Encoding: base64 6331 Content-Type: application/pkcs7-mime; name="smime.p7m"; 6332 smime-type="enveloped-data" 6333 Subject: [...] 6334 Message-ID: 6335 6336 From: Alice 6337 To: Bob 6338 Date: Sat, 20 Feb 2021 12:14:02 -0500 6339 In-Reply-To: 6340 6341 References: 6342 6344 MIIcHAYJKoZIhvcNAQcDoIIcDTCCHAkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 6345 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 6346 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S/MIME encrypted and signed reply over a complex message, 6496 Injected Headers with hcp_minimal 6498 This is a encrypted and signed S/MIME message using PKCS#7 6499 envelopedData around signedData. The payload is a multipart/ 6500 alternative message with an inline image/png attachment. It uses the 6501 Injected Headers header protection scheme with the hcp_minimal Header 6502 Confidentiality Policy. 6504 It has the following structure: 6506 └─╴application/pkcs7-mime [smime.p7m] 9775 bytes 6507 ↧ (decrypts to) 6508 └─╴application/pkcs7-mime [smime.p7m] 6230 bytes 6509 ⇩ (unwraps to) 6510 └┬╴multipart/mixed 1932 bytes 6511 ├┬╴multipart/alternative 1134 bytes 6512 │├─╴text/plain 393 bytes 6513 │└─╴text/html 474 bytes 6514 └─╴image/png inline 236 bytes 6516 Its contents are: 6518 Content-Transfer-Encoding: base64 6519 Content-Type: application/pkcs7-mime; name="smime.p7m"; 6520 smime-type="enveloped-data" 6521 Subject: [...] 6522 Message-ID: 6523 6524 From: Alice 6525 To: Bob 6526 Date: Sat, 20 Feb 2021 12:15:02 -0500 6527 In-Reply-To: 6528 6529 References: 6530 6532 MIIcLAYJKoZIhvcNAQcDoIIcHTCCHBkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 6533 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 6534 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 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S/MIME encrypted and signed reply over a complex message, 6685 Injected Headers with hcp_minimal (+ Legacy Display) 6687 This is a encrypted and signed S/MIME message using PKCS#7 6688 envelopedData around signedData. The payload is a multipart/ 6689 alternative message with an inline image/png attachment. It uses the 6690 Injected Headers header protection scheme with the hcp_minimal Header 6691 Confidentiality Policy with a "Legacy Display" part. 6693 It has the following structure: 6695 └─╴application/pkcs7-mime [smime.p7m] 10465 bytes 6696 ↧ (decrypts to) 6697 └─╴application/pkcs7-mime [smime.p7m] 6728 bytes 6698 ⇩ (unwraps to) 6699 └┬╴multipart/mixed 2278 bytes 6700 ├─╴text/plain 65 bytes 6701 └┬╴multipart/mixed 1612 bytes 6702 ├┬╴multipart/alternative 1206 bytes 6703 │├─╴text/plain 430 bytes 6704 │└─╴text/html 511 bytes 6705 └─╴image/png inline 236 bytes 6707 Its contents are: 6709 Content-Transfer-Encoding: base64 6710 Content-Type: application/pkcs7-mime; name="smime.p7m"; 6711 smime-type="enveloped-data" 6712 Subject: [...] 6713 Message-ID: 6714 From: Alice 6715 To: Bob 6716 Date: Sat, 20 Feb 2021 12:16:02 -0500 6717 In-Reply-To: 6718 6719 References: 6720 6722 MIIeLAYJKoZIhvcNAQcDoIIeHTCCHhkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 6723 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5q37KcgoJk636h+qXkOKikxVCnwCvMcnaF+ZQE6IwmgiV8TUYVVbSCrtL0Dk+5W9 6878 T+ZGROgZe6Ro2g1rKYVGU/D/MpqYJodUNII9AOloc2eWXuIXdGd8CcJADmDJP6z5 6879 bMoGLXudivQpm0hGScHvg0s7A5KUuSGYGJb3eGuKh1GARjkxW/pMbSwpMmob5oMR 6880 UCEA91EKlSWVsYT8utyarh+MHyzSruV2+6qC2n/WVUTQ4moeDRWWDaDiiu/TjVIU 6881 WkscDMV9SU2BaXDlYG/ING15oGkjo/xFxXIF5/eFFXUo8PQNbI6iI/WVsuQGHBMQ 6882 5RYRifuLhgL2N55990m3oajpGCQW/NODMbfK2aJqvcNsgs/5+hmuQBMPN/sbr/C5 6884 A.3.22. S/MIME encrypted and signed reply over a complex message, 6885 Wrapped Message with hcp_strong 6887 This is a encrypted and signed S/MIME message using PKCS#7 6888 envelopedData around signedData. The payload is a multipart/ 6889 alternative message with an inline image/png attachment. It uses the 6890 Wrapped Message header protection scheme with the hcp_strong Header 6891 Confidentiality Policy. 6893 It has the following structure: 6895 └─╴application/pkcs7-mime [smime.p7m] 9730 bytes 6896 ↧ (decrypts to) 6897 └─╴application/pkcs7-mime [smime.p7m] 6192 bytes 6898 ⇩ (unwraps to) 6899 └┬╴message/rfc822 1956 bytes 6900 └┬╴multipart/mixed 1892 bytes 6901 ├┬╴multipart/alternative 1126 bytes 6902 │├─╴text/plain 379 bytes 6903 │└─╴text/html 463 bytes 6904 └─╴image/png inline 232 bytes 6906 Its contents are: 6908 Content-Transfer-Encoding: base64 6909 Content-Type: application/pkcs7-mime; name="smime.p7m"; 6910 smime-type="enveloped-data" 6911 Subject: [...] 6912 Message-ID: <95b9bb39-c028-5ff4-99b1-f179cb5d7585@lhp.example> 6913 From: Alice 6914 To: Bob 6915 Date: Sat, 20 Feb 2021 12:17:02 -0500 6917 MIIcDAYJKoZIhvcNAQcDoIIb/TCCG/kCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 6918 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 6919 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S/MIME encrypted and signed reply over a complex message, 7069 Injected Headers with hcp_strong 7071 This is a encrypted and signed S/MIME message using PKCS#7 7072 envelopedData around signedData. The payload is a multipart/ 7073 alternative message with an inline image/png attachment. It uses the 7074 Injected Headers header protection scheme with the hcp_strong Header 7075 Confidentiality Policy. 7077 It has the following structure: 7079 └─╴application/pkcs7-mime [smime.p7m] 9775 bytes 7080 ↧ (decrypts to) 7081 └─╴application/pkcs7-mime [smime.p7m] 6222 bytes 7082 ⇩ (unwraps to) 7083 └┬╴multipart/mixed 1924 bytes 7084 ├┬╴multipart/alternative 1130 bytes 7085 │├─╴text/plain 391 bytes 7086 │└─╴text/html 472 bytes 7087 └─╴image/png inline 236 bytes 7089 Its contents are: 7091 Content-Transfer-Encoding: base64 7092 Content-Type: application/pkcs7-mime; name="smime.p7m"; 7093 smime-type="enveloped-data" 7094 Subject: [...] 7095 Message-ID: <23abef5f-8781-5c95-a46c-61e3a4464d58@lhp.example> 7096 From: Alice 7097 To: Bob 7098 Date: Sat, 20 Feb 2021 12:18:02 -0500 7100 MIIcLAYJKoZIhvcNAQcDoIIcHTCCHBkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 7101 BAoTBElFVEYxETAPBgNVBAsTCExBTVBTIFdHMTEwLwYDVQQDEyhTYW1wbGUgTEFN 7102 UFMgUlNBIENlcnRpZmljYXRpb24gQXV0aG9yaXR5AhMPLSW9ETmXSs5CVIeh7j00 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TOU7LYJ/mYljf8EPJgsqKRciADk7vhTugpMkkQdHJCdAUbgt9RvZ3RVWLMJ8XzwG 7244 p0Eyrc8bqjEqa1TD7BXY2NgEBNvSQHCa+nikW1CXhx7p26ERd3sLbgU4Upsir/Sr 7245 hUt/oRt75UHlBuiHo3hPoKD8BlVbQ3P4unFMkP4E5viJvPIlvpimfU0QbQd1CTGD 7246 LCiwzxtY5VbUTJh8Bzmsk68W9XYOoFYM86C8eQiwT+iv6SEThhlJ97ZkbIx95jOn 7247 h1HSVD4BG/VrP1sZHn4LDAoIBugbM5HpwUTVX8UvTkHbqIau4kzadGVHHfyKLw2H 7248 YfbatQCNwK/lHTMjGdwd76j+jUZ0QfBYD9e2SwhPF2qGok9gx1glZue65xEC8XM2 7249 hvpBysW+9HrKwp+/SvJc7974MKCcFs76A+Q93/AnXq0lKcYZeDJtBJfjkbqCuvbP 7250 dTYlFvjuVh2TudqGzxeP9g== 7252 A.3.24. S/MIME encrypted and signed reply over a complex message, 7253 Injected Headers with hcp_strong (+ Legacy Display) 7255 This is a encrypted and signed S/MIME message using PKCS#7 7256 envelopedData around signedData. The payload is a multipart/ 7257 alternative message with an inline image/png attachment. It uses the 7258 Injected Headers header protection scheme with the hcp_strong Header 7259 Confidentiality Policy with a "Legacy Display" part. 7261 It has the following structure: 7263 └─╴application/pkcs7-mime [smime.p7m] 10445 bytes 7264 ↧ (decrypts to) 7265 └─╴application/pkcs7-mime [smime.p7m] 6712 bytes 7266 ⇩ (unwraps to) 7267 └┬╴multipart/mixed 2269 bytes 7268 ├─╴text/plain 64 bytes 7269 └┬╴multipart/mixed 1608 bytes 7270 ├┬╴multipart/alternative 1202 bytes 7271 │├─╴text/plain 427 bytes 7272 │└─╴text/html 508 bytes 7273 └─╴image/png inline 236 bytes 7275 Its contents are: 7277 Content-Transfer-Encoding: base64 7278 Content-Type: application/pkcs7-mime; name="smime.p7m"; 7279 smime-type="enveloped-data" 7280 Subject: [...] 7281 Message-ID: <0e210732-9184-5855-9a95-2a635560d3a6@lhp.example> 7282 From: Alice 7283 To: Bob 7284 Date: Sat, 20 Feb 2021 12:19:02 -0500 7286 MIIeHAYJKoZIhvcNAQcDoIIeDTCCHgkCAQAxggMQMIIBhAIBADBsMFUxDTALBgNV 7287 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7zHrKben8nWLAnSxYuWePm9pS0EeXtwCE9oUPcGwoKTq0ubzYpZry884J8uw+e+9 7428 D9SxrAd4BLjEcQW8gVJhPNnvfdx1iSRwyIk6f+Qy3WQ3d0nF7wwQoRFNpUi+MpSc 7429 2RMLciHhcroQ0NG71XG7xE+c4o5TQOGXb8leAaGH7G3fEILGOaVnxfYMcumL2xk7 7430 kfToo/Ubqfgv1weZMzJUZxv2X+HkDBwWGydj75Tq7lVlN+Y2dwtjf9HmrOrTfWZg 7431 z+jgF+1ufbrGhmsuoP+Zy7nqifF1G6KgABs+9TXWg4rZWxGb6/SJRYu49C5F8EDD 7432 P4JNm+1ntLqBaRZqbLXQ2zua+nrG0/Ja/JEjdQfRYxQ0t7x5W2PMJvxLFmtCL+AS 7433 n2Qs0AXcgQbnYRI5KYVKkzJ8PBIP7TegmMhgi+nY9w1KNMbmAiEiYcIgqJ9NUaL2 7434 by6eQGK/ELXUcA1pAbEYiGnN/uH9ttINrhiOz0Gd8D6MajMmwNqrbERxHYlxkGKf 7435 j1i76puXo7lTTCak82jvkbTq+T18OLigbyaTLhTBC7nqeN/3BcvJEOzjaGGRuRGA 7436 9zMXWyB7H03entzGRmSGNexkR94G8b1UbAQN3GRcXRT3hTvd48ksocIeDNYx3HDl 7437 44t6pExdRBR0YPp+kVXSrph4vdOKYLdh6y019dPy0vw4m5NrDd4uNtUOkWtGMhn2 7438 wE71YSl3b5vy7wOQaP9Jgps64bhf3iRAr1gSAkoT0rFW0fDJR7VV5rwSRaB/re7y 7439 dS8ddUx/0qIE+/iddSWKkPZIIDWiCQrcUxQqOjS5fxDnzoaaqll0umEDR1zy9KdX 7440 5UyWiNctfexihp8WuPGsO5WoqdaVUUHLBaa3ZzIEgbVmXW/OCReAxjIwZpsOUHWI 7441 PilkacVmrYOp2Msg1Wqw74MekZZxf/v9oAP1kFkA12psIw5fnYXKiejtsrxOvXdI 7442 0Uc55ruTMaMI/SqihEwu6CRjjSDCr6xaFMlKhsE/xAKiJZH0u80QaTm5yT42Cd47 7443 2n6rCBQmKBoJBKELW+YzoN7v0Kcf1gogx8OXcA0UzZLx9/JLfaxlfUKt8dx8kPzZ 7444 UkEdz448mE/V90sUVHGPV1rSOZGSaxe+OKchRRUpYM12xcvldvbDxynLfRI6OUYQ 7445 OC2cH0uJ4wCTCqlRKVvlpZBYRGmQZzfgtZNuFPXkGMfgJ/nMtKasqPNdqTglFubI 7446 jyUq8xdFzYuIeydv7m6Tf2jBawV8zHbQ/2ZkLl8WUPU= 7448 Appendix B. Additional information 7450 B.1. Stored Variants of Messages with Bcc 7452 Messages containing at least one recipient address in the Bcc header 7453 field may appear in up to three different variants: 7455 1. The Message for the recipient addresses listed in To or Cc header 7456 fields, which must not include the Bcc header field neither for 7457 signature calculation nor for encryption. 7459 2. The Message(s) sent to the recipient addresses in the Bcc header 7460 field, which depends on the implementation: 7462 a) One Message for each recipient in the Bcc header field 7463 separately, with a Bcc header field containing only the address 7464 of the recipient it is sent to. 7466 b) The same Message for each recipient in the Bcc header field 7467 with a Bcc header field containing an indication such as 7468 "Undisclosed recipients", but no addresses. 7470 c) The same Message for each recipient in the Bcc header field 7471 which does not include a Bcc header field (this Message is 7472 identical to 1. / cf. above). 7474 3. The Message stored in the 'Sent'-Folder of the sender, which 7475 usually contains the Bcc unchanged from the original Message, 7476 i.e., with all recipient addresses. 7478 The most privacy preserving method of the alternatives (2a, 2b, and 7479 2c) is to standardize 2a, as in the other cases (2b and 2c), 7480 information about hidden recipients is revealed via keys. In any 7481 case, the Message has to be cloned and adjusted depending on the 7482 recipient. 7484 Appendix C. Text Moved from Above 7486 Note: Per an explicit request by the chair of the LAMPS WG to only 7487 present one option for the specification, the following text has been 7488 stripped from the main body of the draft. It is preserved in an 7489 Appendix for the time being and may be moved back to the main body or 7490 deleted, depending on the decision of the LAMPS WG. 7492 C.1. MIME Format 7494 Currently there are two options in discussion: 7496 1. The option according to the current S/MIME specification (cf. 7497 [RFC8551]) 7499 2. An alternative option that is based on the former "memory hole" 7500 approach (cf. [I-D.autocrypt-lamps-protected-headers]) 7502 C.1.1. S/MIME Specification 7504 Note: This is currently described in the main part of this document. 7506 C.1.1.1. Alternative Option Autocrypt "Protected Headers" (Ex-"Memory 7507 Hole") 7509 An alternative option (based on the former autocrypt "Memory Hole" 7510 approach) to be considered, is described in 7511 [I-D.autocrypt-lamps-protected-headers]. 7513 Unlike the option described in Appendix C.1.1, this option does not 7514 use a "message/RFC822" wrapper to unambiguously delimit the Inner 7515 Message. 7517 Before choosing this option, the following two issues must be 7518 assessed to ensure no interoperability issues result from it: 7520 1. How current MIME parser implementations treat non-MIME Header 7521 Fields, which are not part of the outermost MIME entity and not 7522 part of a Message wrapped into a MIME entity of media type 7523 "message/rfc822", and how such Messages are rendered to the user. 7525 [I-D.autocrypt-lamps-protected-headers] provides some examples 7526 for testing this. 7528 2. MIME-conformance, i.e. whether or not this option is (fully) 7529 MIME-conformant [RFC2045] ff., in particular also Section 5.1. of 7530 [RFC2046] on "Multipart Media Type). In the following an excerpt 7531 of paragraphs that may be relevant in this context: 7533 The only header fields that have defined meaning for body parts 7534 are those the names of which begin with "Content-". All other 7535 header fields may be ignored in body parts. Although they 7536 should generally be retained if at all possible, they may be 7537 discarded by gateways if necessary. Such other fields are 7538 permitted to appear in body parts but must not be depended on. 7539 "X-" fields may be created for experimental or private 7540 purposes, with the recognition that the information they 7541 contain may be lost at some gateways. 7543 NOTE: The distinction between an RFC 822 Message and a body 7544 part is subtle, but important. A gateway between Internet and 7545 X.400 mail, for example, must be able to tell the difference 7546 between a body part that contains an image and a body part 7547 that contains an encapsulated Message, the body of which is a 7548 JPEG image. In order to represent the latter, the body part 7549 must have "Content-Type: message/rfc822", and its body (after 7550 the blank line) must be the encapsulated Message, with its own 7551 "Content-Type: image/jpeg" header field. The use of similar 7552 syntax facilitates the conversion of Messages to body parts, 7553 and vice versa, but the distinction between the two must be 7554 understood by implementors. (For the special case in which 7555 parts actually are Messages, a "digest" subtype is also 7556 defined.) 7558 The MIME structure of an Email Message looks as follows: 7560 7562 7564 7566 7568 The following example demonstrates how an Original Message might be 7569 protected, i.e., the Original Message is contained as Inner Message 7570 in the Protected Body of an Outer Message. It illustrates the first 7571 Body part (of the Outer Message) as a "multipart/signed" 7572 (application/pkcs7-signature) media type: 7574 Lines are prepended as follows: 7576 * "O: " Outer Message Header Section 7578 * "I: " Message Header Section 7579 O: Date: Mon, 25 Sep 2017 17:31:42 +0100 (GMT Daylight Time) 7580 O: Message-ID: 7581 O: Subject: Meeting at my place 7582 O: From: "Alexey Melnikov" 7583 O: MIME-Version: 1.0 7584 O: Content-Type: multipart/signed; charset=us-ascii; micalg=sha1; 7585 O: protocol="application/pkcs7-signature"; 7586 O: boundary=boundary-AM 7588 This is a multipart message in MIME format. 7589 --boundary-AM 7590 I: Date: Mon, 25 Sep 2017 17:31:42 +0100 (GMT Daylight Time) 7591 I: From: "Alexey Melnikov" 7592 I: Message-ID: 7593 I: MIME-Version: 1.0 7594 I: MMHS-Primary-Precedence: 3 7595 I: Subject: Meeting at my place 7596 I: To: somebody@example.net 7597 I: X-Mailer: Isode Harrier Web Server 7598 I: Content-Type: text/plain; charset=us-ascii 7600 This is an important message that I don't want to be modified. 7602 --boundary-AM 7603 Content-Transfer-Encoding: base64 7604 Content-Type: application/pkcs7-signature 7606 [[base-64 encoded signature]] 7608 --boundary-AM-- 7610 The Outer Message Header Section is unprotected, while the remainder 7611 (Outer Message Body) is protected. The Outer Message Body consists 7612 of the Inner Message (Header Section and Body). 7614 The Inner Message Header Section is the same as (or a subset of) the 7615 Original Message Header Section. 7617 The Inner Message Body is the same as the Original Message Body. 7619 The Original Message itself may contain any MIME structure. 7621 C.1.2. Sending Side 7623 To ease explanation, the following describes the case where an 7624 Original (message/rfc822) Message to be protected is present. If 7625 this is not the case, Original Message means the (virtual) Message 7626 that would be constructed for sending it as unprotected email. 7628 C.1.2.1. Inner Message Header Fields 7630 It is RECOMMENDED that the Inner Message contains all Header Fields 7631 of the Original Message with the exception of the following Header 7632 Field, which MUST NOT be included within the Inner Message nor within 7633 any other protected part of the Message: 7635 * Bcc 7637 [[ TODO: Bcc handling needs to be further specified (see also 7638 Appendix B.1). Certain MUAs cannot properly decrypt Messages with 7639 Bcc recipients. ]] 7641 C.1.2.2. Wrapper 7643 The wrapper is a simple MIME Header Section followed by an empty line 7644 preceding the Inner Message (inside the Outer Message Body). The 7645 media type of the wrapper MUST be "message/RFC822" and MUST contain 7646 the Content-Type header field parameter "forwarded=no" as defined in 7647 [I-D.melnikov-iana-reg-forwarded]. The wrapper unambiguously 7648 delimits the Inner Message from the rest of the Message. 7650 C.1.2.3. Cryptographic Layers / Envelope 7652 [[ TODO: Basically refer to S/MIME standards ]] 7654 C.1.2.4. Sending Side Message Processing 7656 For a protected Message the following steps are applied before a 7657 Message is handed over to the Submission Entity: 7659 C.1.2.4.1. Step 1: Decide on Protection Level and Information 7660 Disclosure 7662 The implementation which applies protection to a Message must decide: 7664 * Which Protection Level (signature and/or encryption) shall be 7665 applied to the Message? This depends on user request and/or local 7666 policy as well as availability of cryptographic keys. 7668 * Which Header Fields of the Original Message shall be part of the 7669 Outer Message Header Section? This typically depends on local 7670 policy. By default, the Essential Header Fields are part of the 7671 Outer Message Header Section; cf. Appendix C.1.2.5. 7673 * Which of these Header Fields are to be obfuscated? This depends 7674 on local policy and/or specific Privacy requirements of the user. 7675 By default only the Subject Header Field is obfuscated; cf. 7676 Appendix C.1.2.5. 7678 C.1.2.4.2. Step 2: Compose the Outer Message Header Section 7680 Depending on the decision in Appendix C.1.2.4.1, the implementation 7681 shall compose the Outer Message Header Section. (Note that this also 7682 includes the necessary MIME Header Section part for the following 7683 protection layer.) 7685 Outer Header Fields that are not obfuscated should contain the same 7686 values as in the Original Message (except for MIME Header 7687 Section part, which depends on the Protection Level selected in 7688 Appendix C.1.2.4.1). 7690 C.1.2.4.3. Step 3: Apply Protection to the Original Message 7692 Depending on the Protection Level selected in Appendix C.1.2.4.1, the 7693 implementation applies signature and/or encryption to the Original 7694 Message, including the wrapper (as per [RFC8551]), and sets the 7695 resulting package as the Outer Message Body. 7697 The resulting (Outer) Message is then typically handed over to the 7698 Submission Entity. 7700 [[ TODO: Example ]] 7702 C.1.2.5. Outer Message Header Fields 7704 C.1.2.5.1. Encrypted Messages 7706 To maximize Privacy, it is strongly RECOMMENDED to follow the 7707 principle of Data Minimization (cf. Section 2.1). 7709 However, the Outer Message Header Section SHOULD contain the 7710 Essential Header Fields and, in addition, MUST contain the Header 7711 Fields of the MIME Header Section part to describe Cryptographic 7712 Layer of the protected MIME subtree as per [RFC8551]. 7714 The following Header Fields are defined as the Essential Header 7715 Fields: 7717 * From 7719 * To (if present in the Original Message) 7720 * Cc (if present in the Original Message) 7722 * Bcc (if present in the Original Message, see also Appendix B.1) 7724 * Date 7726 * Message-ID 7728 * Subject 7730 Further processing by the Submission Entity normally depends on part 7731 of these Header Fields, e.g. From and Date HFs are required by 7732 [RFC5322]. Furthermore, not including certain Header Fields may 7733 trigger spam detection to flag the Message, and/or lead to user 7734 experience (UX) issues. 7736 For further Data Minimization, the value of the Subject Header Field 7737 SHOULD be obfuscated as follows: 7739 * Subject: [...] 7741 and it is RECOMMENDED to replace the Message-ID by a new randomly 7742 generated Message-ID. 7744 In addition, the value of other Essential Header Fields MAY be 7745 obfuscated. 7747 Non-Essential Header Fields SHOULD be omitted from the Outer Message 7748 Header Section where possible. If Non-essential Header Fields are 7749 included in the Outer Message Header Section, those MAY be obfuscated 7750 too. 7752 Header Fields that are not obfuscated should contain the same values 7753 as in the Original Message. 7755 If an implementation obfuscates the From, To, and/or Cc Header 7756 Fields, it may need to provide access to the clear text content of 7757 these Header Fields to the Submission Entity for processing purposes. 7758 This is particularly relevant, if proprietary Submission Entities are 7759 used. Obfuscation of Header Fields may adversely impact spam 7760 filtering. 7762 (A use case for obfuscation of all Outer Message Header Fields is 7763 routing email through the use of onion routing or mix networks, e.g. 7764 [pEp.mixnet].) 7765 The MIME Header Section part is the collection of MIME Header Fields 7766 describing the following MIME structure as defined in [RFC2045]. A 7767 MIME Header Section part typically includes the following Header 7768 Fields: 7770 * Content-Type 7772 * Content-Transfer-Encoding 7774 * Content-Disposition 7776 The following example shows the MIME Header Section part of an S/MIME 7777 signed Message (using application/pkcs7-mime with SignedData): 7779 MIME-Version: 1.0 7780 Content-Type: application/pkcs7-mime; smime-type=signed-data; 7781 name=smime.p7m 7782 Content-Transfer-Encoding: base64 7783 Content-Disposition: attachment; filename=smime.p7m 7785 Depending on the scenario, further Header Fields MAY be exposed in 7786 the Outer Message Header Section, which is NOT RECOMMENDED unless 7787 justified. Such Header Fields may include e.g.: 7789 * References 7791 * Reply-To 7793 * In-Reply-To 7795 C.1.2.5.2. Unencrypted Messages 7797 The Outer Message Header Section of unencrypted Messages SHOULD 7798 contain at least the Essential Header Fields and, in addition, MUST 7799 contain the Header Fields of the MIME Header Section part to describe 7800 Cryptographic Layer of the protected MIME subtree as per [RFC8551]. 7801 It may contain further Header Fields, in particular those also 7802 present in the Inner Message Header Section. 7804 Appendix D. Document Considerations 7806 [[ RFC Editor: This section is to be removed before publication ]] 7808 This draft is built from markdown source, and its development is 7809 tracked in a git repository (https://gitlab.com/dkg/lamps-header- 7810 protection). 7812 While minor editorial suggestions and nit-picks can be made as merge 7813 requests (https://gitlab.com/dkg/lamps-header-protection), please 7814 direct all substantive discussion to the LAMPS mailing list 7815 (https://www.ietf.org/mailman/listinfo/spasm) at "spasm@ietf.org". 7817 Appendix E. Document Changelog 7819 [[ RFC Editor: This section is to be removed before publication ]] 7821 * draft-ietf-lamps-header-protection-05 7823 - fix multipart/signed wrapped test vectors 7825 * draft-ietf-lamps-header-protection-04 7827 - add test vectors 7829 - add "problems with Injected Messages" subsection 7831 * draft-ietf-lamps-header-protection-03 7833 - dkg takes over from Bernie as primary author 7835 - Add Usability section 7837 - describe two distinct formats "Wrapped Message" and "Injected 7838 Headers" 7840 - Introduce Header Confidentiality Policy model 7842 - Overhaul message composition guidance 7844 - Simplify document creation workflow, move public face to gitlab 7846 * draft-ietf-lamps-header-protection-02 7848 - editorial changes / improve language 7850 * draft-ietf-lamps-header-protection-01 7852 - Add DKG as co-author 7854 - Partial Rewrite of Abstract and Introduction [HB/AM/DKG] 7856 - Adding definiations for Cryptographic Layer, Cryptographic 7857 Payload, and Cryptographic Envelope (reference to 7858 [I-D.dkg-lamps-e2e-mail-guidance]) [DKG] 7860 - Enhanced MITM Definition to include Machine- / Meddler-in-the- 7861 middle [HB] 7863 - Relaxed definition of Original message, which may not be of 7864 type "message/rfc822" [HB] 7866 - Move "memory hole" option to the Appendix (on request by Chair 7867 to only maintain one option in the specification) [HB] 7869 - Updated Scope of Protection Levels according to WG discussion 7870 during IETF-108 [HB] 7872 - Obfuscation recommendation only for Subject and Message-Id and 7873 distinguish between Encrypted and Unencrypted Messages [HB] 7875 - Removed (commented out) Header Field Flow Figure (it appeared 7876 to be confusing as is was) [HB] 7878 * draft-ietf-lamps-header-protection-00 7880 - Initial version (text partially taken over from 7881 [I-D.ietf-lamps-header-protection-requirements] 7883 Appendix F. Open Issues 7885 [[ RFC Editor: This section should be empty and is to be removed 7886 before publication. ]] 7888 * Ensure "protected header" (Ex-Memory-Hole) option is (fully) 7889 compliant with the MIME standard, in particular also [RFC2046], 7890 Section 5.1. (Multipart Media Type) Appendix C.1.1.1. 7892 * Test Vectors! We can point to the relevant test vector in the 7893 main text by reference. We should also include in the test 7894 vectors an encrypted message that references another message, so 7895 we can observe the effect of the HCP on threading. 7897 * Should Outer Message Header Section (as received) be preserved for 7898 the user? (Section 4.1.4.5) 7900 * Decide on whether or not merge requirements from 7901 [I-D.ietf-lamps-header-protection-requirements] into this 7902 document. 7904 * Decide what parts of [I-D.autocrypt-lamps-protected-headers] to 7905 merge into this document. 7907 * Enhance Introduction Section 1 and Problem Statement (Section 2). 7909 * Decide on whether or not specification for more legacy HP 7910 requirements should be added to this document (Section 3.1.2). 7912 * Verify simple backward compatibility case (Receiving Side MIME- 7913 Conformant) is working; once solution is stable and update 7914 paragraphs in Section 4.1, Section 3.1.2.1 and Section 4.2.1 7915 accordingly. 7917 * Verify ability to distinguish between Messages with Header 7918 Protection as specified in this document and legacy clients and 7919 update Section 3.1 accordingly. 7921 * Improve definitions of Protection Levels and enhance list of 7922 Protection Levels (Section 3.2, Section 4). 7924 * Privacy Considerations Section 7 7926 * Security Considerations Section 6 7928 Authors' Addresses 7930 Daniel Kahn Gillmor 7931 American Civil Liberties Union 7932 125 Broad St. 7933 New York, NY, 10004 7934 United States of America 7936 Email: dkg@fifthhorseman.net 7938 Bernie Hoeneisen 7939 pEp Foundation 7940 Oberer Graben 4 7941 CH- CH-8400 Winterthur 7942 Switzerland 7944 Email: bernie.hoeneisen@pep.foundation 7945 URI: https://pep.foundation/ 7947 Alexey Melnikov 7948 Isode Ltd 7949 14 Castle Mews 7950 Hampton, Middlesex 7951 TW12 2NP 7952 United Kingdom 7954 Email: alexey.melnikov@isode.com