RFC 5751: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Message Specification

This document defines Secure/Multipurpose Internet Mail Extensions (S/MIME) version 3.2. S/MIME provides a consistent way to send and receive secure MIME…

Read RFC 5751 on the RFC Editor

Outgoing relationships (29 related RFCs)

Obsoletes, Informative reference — RFC 3851: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Message Specification
Normative reference — RFC 2046: Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types
Normative reference — RFC 2047: MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text
Normative reference — RFC 3370: Cryptographic Message Syntax (CMS) Algorithms
Normative reference — RFC 2049: Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples
Normative reference — RFC 2183: Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field
Normative reference — RFC 1847: Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted
Normative reference — RFC 3565: Use of the Advanced Encryption Standard (AES) Encryption Algorithm in Cryptographic Message Syntax (CMS)
Normative reference — RFC 5754: Using SHA2 Algorithms with Cryptographic Message Syntax
Normative reference — RFC 3274: Compressed Data Content Type for Cryptographic Message Syntax (CMS)
Normative reference — RFC 3560: Use of the RSAES-OAEP Key Transport Algorithm in Cryptographic Message Syntax (CMS)
Normative reference — RFC 4056: Use of the RSASSA-PSS Signature Algorithm in Cryptographic Message Syntax (CMS)
Normative reference — RFC 4289: Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures
Normative reference — RFC 5750: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Certificate Handling
Informative reference — RFC 3852: Cryptographic Message Syntax (CMS)
Informative reference — RFC 2631: Diffie-Hellman Key Agreement Method
Informative reference — RFC 2633: S/MIME Version 3 Message Specification
Informative reference — RFC 2315: PKCS #7: Cryptographic Message Syntax Version 1.5
Informative reference — RFC 2630: Cryptographic Message Syntax
Informative reference — RFC 3766: Determining Strengths For Public Keys Used For Exchanging Symmetric Keys
Informative reference — RFC 4270: Attacks on Cryptographic Hashes in Internet Protocols
Informative reference — RFC 2313: PKCS #1: RSA Encryption Version 1.5
Informative reference — RFC 3850: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Certificate Handling
Informative reference — RFC 2311: S/MIME Version 2 Message Specification
Informative reference — RFC 2785: Methods for Avoiding the "Small-Subgroup" Attacks on the Diffie-Hellman Key Agreement Method for S/MIME
Informative reference — RFC 2314: PKCS #10: Certification Request Syntax Version 1.5
Informative reference — RFC 2312: S/MIME Version 2 Certificate Handling
Informative reference — RFC 2632: S/MIME Version 3 Certificate Handling
Informative reference — RFC 3218: Preventing the Million Message Attack on Cryptographic Message Syntax

Incoming relationships (43 related RFCs)

Obsoleted by — RFC 8551: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message Specification
Normatively referenced by — RFC 5753: Use of Elliptic Curve Cryptography (ECC) Algorithms in Cryptographic Message Syntax (CMS)
Normatively referenced by — RFC 7030: Enrollment over Secure Transport
Normatively referenced by — RFC 5754: Using SHA2 Algorithms with Cryptographic Message Syntax
Normatively referenced by — RFC 5750: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Certificate Handling
Normatively referenced by — RFC 5752: Multiple Signatures in Cryptographic Message Syntax (CMS)
Normatively referenced by — RFC 6230: Media Control Channel Framework
Normatively referenced by — RFC 5990: Use of the RSA-KEM Key Transport Algorithm in the Cryptographic Message Syntax (CMS)
Normatively referenced by — RFC 6210: Experiment: Hash Functions with Parameters in the Cryptographic Message Syntax (CMS) and S/MIME
Normatively referenced by — RFC 8418: Use of the Elliptic Curve Diffie-Hellman Key Agreement Algorithm with X25519 and X448 in the Cryptographic Message Syntax (CMS)
Normatively referenced by — RFC 6277: Online Certificate Status Protocol Algorithm Agility
Normatively referenced by — RFC 8162: Using Secure DNS to Associate Certificates with Domain Names for S/MIME
Normatively referenced by — RFC 6476: Using Message Authentication Code (MAC) Encryption in the Cryptographic Message Syntax (CMS)
Normatively referenced by — RFC 7281: Authentication-Results Registration for S/MIME Signature Verification
Normatively referenced by — RFC 8295: EST (Enrollment over Secure Transport) Extensions
Normatively referenced by — RFC 6109: La Posta Elettronica Certificata - Italian Certified Electronic Mail
Normatively referenced by — RFC 6216: Example Call Flows Using Session Initiation Protocol (SIP) Security Mechanisms
Normatively referenced by — RFC 7114: Creation of a Registry for smime-type Parameter Values
Normatively referenced by — RFC 8103: Using ChaCha20-Poly1305 Authenticated Encryption in the Cryptographic Message Syntax (CMS)
Informatively referenced by — RFC 6268: Additional New ASN.1 Modules for the Cryptographic Message Syntax (CMS) and the Public Key Infrastructure Using X.509 (PKIX)
Informatively referenced by — RFC 6350: vCard Format Specification
Informatively referenced by — RFC 6679: Explicit Congestion Notification (ECN) for RTP over UDP
Informatively referenced by — RFC 8152: CBOR Object Signing and Encryption (COSE)
Informatively referenced by — RFC 9052: CBOR Object Signing and Encryption (COSE): Structures and Process
Informatively referenced by — RFC 6530: Overview and Framework for Internationalized Email
Informatively referenced by — RFC 6409: Message Submission for Mail
Informatively referenced by — RFC 7696: Guidelines for Cryptographic Algorithm Agility and Selecting Mandatory-to-Implement Algorithms
Informatively referenced by — RFC 6257: Bundle Security Protocol Specification
Informatively referenced by — RFC 7416: A Security Threat Analysis for the Routing Protocol for Low-Power and Lossy Networks (RPLs)
Informatively referenced by — RFC 5756: Updates for RSAES-OAEP and RSASSA-PSS Algorithm Parameters
Informatively referenced by — RFC 7070: An Architecture for Reputation Reporting
Informatively referenced by — RFC 6584: Simple Authentication Schemes for the Asynchronous Layered Coding (ALC) and NACK-Oriented Reliable Multicast (NORM) Protocols
Informatively referenced by — RFC 6726: FLUTE - File Delivery over Unidirectional Transport
Informatively referenced by — RFC 5989: A SIP Event Package for Subscribing to Changes to an HTTP Resource
Informatively referenced by — RFC 6128: RTP Control Protocol (RTCP) Port for Source-Specific Multicast (SSM) Sessions
Informatively referenced by — RFC 6664: S/MIME Capabilities for Public Key Definitions
Informatively referenced by — RFC 7104: Duplication Grouping Semantics in the Session Description Protocol
Informatively referenced by — RFC 7193: The application/cms Media Type
Informatively referenced by — RFC 9788: Header Protection for Cryptographically Protected Email
Informatively referenced by — RFC 6477: Registration of Military Message Handling System (MMHS) Header Fields for Use in Internet Mail
Informatively referenced by — RFC 6753: A Location Dereference Protocol Using HTTP-Enabled Location Delivery (HELD)
Informatively referenced by — RFC 7165: Use Cases and Requirements for JSON Object Signing and Encryption (JOSE)
Informatively referenced by — RFC 7508: Securing Header Fields with S/MIME