Note that this resurrects an expired draft very little changed.
On Behalf Of Internet-Drafts(_at_)ietf(_dot_)org
Sent: Thursday, June 28, 2007 3:50 PM
Subject: I-D ACTION:draft-ietf-smime-multisig-01.txt
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
Title : Multiple Signatures in S/MIME
Author(s) : S. Turner, et al.
Filename : draft-ietf-smime-multisig-01.txt
Pages : 17
Date : 2007-6-28
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.
A URL for this Internet-Draft is:
To remove yourself from the I-D Announcement list, send a message to
i-d-announce-request(_at_)ietf(_dot_)org with the word unsubscribe in the body
You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce
to change your subscription settings.
Internet-Drafts are also available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in, type
"cd internet-drafts" and then "get draft-ietf-smime-multisig-01.txt".
A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
Internet-Drafts can also be obtained by e-mail.
Send a message to:
In the body type:
NOTE: The mail server at ietf.org can return the document in
MIME-encoded form by using the "mpack" utility. To use this
feature, insert the command "ENCODING mime" before the "FILE"
command. To decode the response(s), you will need "munpack" or
a MIME-compliant mail reader. Different MIME-compliant mail readers
exhibit different behavior, especially when dealing with
"multipart" MIME messages (i.e. documents which have been split
up into multiple messages), so check your local documentation on
how to manipulate these messages.
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the