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RFC 6211: Cryptographic Message Syntax (CMS) Algorithm Identifier Protection Attribute

In plain English — editorial summary, not part of the RFC

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]

Document record

Document ID
RFC6211
Published
April 2011
Authors
J. Schaad
Status
PROPOSED STANDARD
Stream
IETF
Area
—
Pages
11
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canonical URL: /rfc/6211-cryptographic-message-syntax-cms-algorithm-identifier-protection-attribute