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RFC 6211
Title: Cryptographic Message Syntax (CMS) Algorithm
Identifier Protection Attribute
Author: J. Schaad
Status: Standards Track
Stream: IETF
Date: April 2011
Mailbox: ietf@augustcellars.com
Pages: 11
Characters: 22646
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-schaad-smime-algorithm-attribute-05.txt
URL: http://www.rfc-editor.org/rfc/rfc6211.txt
The Cryptographic Message Syntax (CMS), unlike X.509/PKIX
certificates, is vulnerable to algorithm substitution attacks. In an
algorithm substitution attack, the attacker changes either the
algorithm being used or the parameters of the algorithm in order to
change the result of a signature verification process. In X.509
certificates, the signature algorithm is protected because it is
duplicated in the TBSCertificate.signature field with the proviso
that the validator is to compare both fields as part of the signature
validation process. This document defines a new attribute that
contains a copy of the relevant algorithm identifiers so that they
are protected by the signature or authentication process.
[STANDARDS-TRACK]
This is now a Proposed Standard Protocol.
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 Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol. Distribution of this memo is unlimited.
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