I-D ACTION:draft-ietf-smime-multisig-00.txt

A New Internet-Draft is available from the on-line Internet-Drafts 
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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
	Filename	: draft-ietf-smime-multisig-00.txt
	Pages		: 
	Date		: 2006-12-19

         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 'stronger' algorithm(s). This 
         document defines a signed 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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