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Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Message Specification (RFC3851)

IP.com Disclosure Number: IPCOM000029951D
Original Publication Date: 2004-Jul-01
Included in the Prior Art Database: 2019-Feb-11
Document File: 36 page(s) / 51K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Ramsdell: AUTHOR

Related Documents

10.17487/RFC3851: DOI

Abstract

This document defines Secure/Multipurpose Internet Mail Extensions (S/MIME) version 3.1. S/MIME provides a consistent way to send and receive secure MIME data. Digital signatures provide authentication, message integrity, and non-repudiation with proof of origin. Encryption provides data confidentiality. Compression can be used to reduce data size. This document obsoletes RFC 2633. [STANDARDS-TRACK]

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Network Working Group B. Ramsdell, Editor Request for Comments: 3851 Sendmail, Inc. Obsoletes: 2633 July 2004 Category: Standards Track

Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Message Specification

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2004).

Abstract

This document defines Secure/Multipurpose Internet Mail Extensions (S/MIME) version 3.1. S/MIME provides a consistent way to send and receive secure MIME data. Digital signatures provide authentication, message integrity, and non-repudiation with proof of origin. Encryption provides data confidentiality. Compression can be used to reduce data size. This document obsoletes RFC 2633.

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Specification Overview . . . . . . . . . . . . . . . . . 3 1.2. Terminology. . . . . . . . . . . . . . . . . . . . . . . 3 1.3. Definitions. . . . . . . . . . . . . . . . . . . . . . . 4 1.4. Compatibility with Prior Practice of S/MIME. . . . . . . 5 1.5. Changes Since S/MIME v3. . . . . . . . . . . . . . . . . 5 2. CMS Options. . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1. DigestAlgorithmIdentifier. . . . . . . . . . . . . . . . 5 2.2. SignatureAlgorithmIdentifier . . . . . . . . . . . . . . 6 2.3. KeyEncryptionAlgorithmIdentifier . . . . . . . . . . . . 6 2.4. General Syntax . . . . . . . . . . . . . . . . . . . . . 6 2.5. Attributes and the SignerInfo Type . . . . . . . . . . . 7 2.6. SignerIdentifier SignerInfo Type . . . . . . . . . . . . 11 2.7. ContentEncryptionAlgorithmIdentifier . . . . . . . . . . 12 3. Creating S/MIME Messages . . . . . . . . . . . . . . . . . . . 14

Ramsdell Standards Track [Page 1]

RFC 3851 S/MIME 3.1 Message Specification July 2004

3.1. Preparing the MIME Entity for Signing, Enveloping or Compressing . . . . . . . . . . . . . . . . . . . . . 14 3.2. The application/pkcs7-mime Type. . . . . . . . . . . . . 19 3.3. Creating an Enveloped-only Message . . . . . . . . . . . 21 3.4. Creating a Signed-only Message . . . . . . . . . . . . . 22 3.5. Creating an Compressed-only Message. . . . . . . . . . . 26 3.6. Multiple Operations. . . . . . . . . . . . . . . . . . . 27 3.7. Creating a Certificate Management Messagetoc . . . . . . 27 3.8. Registration Requests. . . . . . . . . . . . . . . . . . 28 3.9. Identifying an S/MIME Message. . . . . . . . . . . . . . 28 4. Certificate Processing . . . . . . . . . . . . . . . . . . . . 29 4.1. Key Pair Generation. . . . . . . . . . . . . . . . . . . 29 5. Security Considerations. . . . . . . . . . . . . . . . . . . . 29 A. ASN.1 Module . . . . . . . . . . . . . . ....

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