RFC 5652 · INTERNET STANDARD · 2009
WED · 29 JUL 2026
Cryptographic Message Syntax
Overview
RFC 5652, “Cryptographic Message Syntax”, is an Internet Standard document published in September 2009 by R. Housley. It obsoletes RFC 3852. It has since been updated by RFC 8933, RFC 9629. The canonical text is published by the RFC Editor.
Abstract
This document describes the Cryptographic Message Syntax (CMS). This syntax is used to digitally sign, digest, authenticate, or encrypt arbitrary message content. [STANDARDS-TRACK]
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
Read this RFC
The canonical text of RFC 5652 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 2009
- RFC 5651 Layered Coding Transport Building Block
- RFC 5653 Generic Security Service API Version 2: Java Bindings Update
- RFC 5650 Definitions of Managed Objects for Very High Speed Digital Subscriber Line 2
- RFC 5654 Requirements of an MPLS Transport Profile
- RFC 5649 Advanced Encryption Standard Key Wrap with Padding Algorithm
- RFC 5655 Specification of the IP Flow Information Export File Format
- RFC 5648 Multiple Care-of Addresses Registration
- RFC 5656 Elliptic Curve Algorithm Integration in the Secure Shell Transport Layer