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RFC 5752

"Multiple Signatures in Cryptographic Message Syntax (CMS)", January 2010

Canonical URL:
http://www.rfc-editor.org/rfc/rfc5752.txt
This document is also available in this non-normative format: PDF.
Status:
PROPOSED STANDARD
Authors:
S. Turner
J. Schaad
Stream:
IETF
Source:
smime (sec)

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Abstract

Cryptographic Message Syntax (CMS) SignedData includes the SignerInfo structure to convey per-signer information. SignedData supports multiple signers and multiple signature algorithms per signer with multiple SignerInfo structures. If a signer attaches more than one SignerInfo, there are concerns that an attacker could perform a downgrade attack by removing the SignerInfo(s) with the \'strong' algorithm(s). This document defines the multiple-signatures attribute, its generation rules, and its processing rules to allow signers to convey multiple SignerInfo objects while protecting against downgrade attacks. Additionally, this attribute may assist during periods of algorithm migration. [STANDARDS-TRACK]


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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