This version incorporates changes to address WG LC comments, ID nits, and
fixing some ASN.1 bugs to make the module compile. We'll forward this
version along to the Security AD.
spt
-----Original Message-----
From: Internet-Drafts(_at_)ietf(_dot_)org
[mailto:Internet-Drafts(_at_)ietf(_dot_)org]
Sent: Tuesday, January 22, 2008 2:50 PM
To: i-d-announce(_at_)ietf(_dot_)org
Cc: ietf-smime(_at_)imc(_dot_)org
Subject: I-D Action:draft-ietf-smime-multisig-04.txt
A New Internet-Draft is available from the on-line
Internet-Drafts directories.
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-04.txt
Pages : 20
Date : 2008-01-22
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.
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described
in [RFC2119].
Discussion
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