A new Request for Comments is now available in online RFC libraries.
RFC 9709
Title: Encryption Key Derivation in the
Cryptographic Message Syntax (CMS) Using HKDF
with SHA-256
Author: R. Housley
Status: Standards Track
Stream: IETF
Date: January 2025
Mailbox: [email protected]
Pages: 13
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-lamps-cms-cek-hkdf-sha256-05.txt
URL: https://www.rfc-editor.org/info/rfc9709
DOI: 10.17487/RFC9709
This document specifies the derivation of the content-encryption key
or the content-authenticated-encryption key in the Cryptographic
Message Syntax (CMS) using the HMAC-based Extract-and-Expand Key
Derivation Function (HKDF) with SHA-256. The use of this mechanism
provides protection against an attacker that manipulates the
content-encryption algorithm identifier or the
content-authenticated-encryption algorithm identifier.
This document is a product of the Limited Additional Mechanisms for PKIX and
SMIME Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: 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 Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
memo is unlimited.
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