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A New Internet-Draft is available from the on-line Internet-Drafts
This draft is a work item of the S/MIME Mail Security Working Group of the IETF.
Title : Multiple Signatures in S/MIME
Author(s) : S. Turner, J. Schaad
Filename : draft-ietf-smime-multisig-05.txt
Pages : 20
Date : 2008-3-11
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 while protecting against
downgrade attacks. Additionally, this attribute may assist during
periods of algorithm migration.
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Internet-Drafts are also available by anonymous FTP at:
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