Re: [Ipsec] CCM: AAD construction

Stephen Kent <kent@bbn.com> Thu, 07 April 2005 08:34 UTC

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Date: Thu, 07 Apr 2005 04:07:33 -0400
To: "Bansal, Yogesh" <yogesh.bansal@intel.com>
From: Stephen Kent <kent@bbn.com>
Subject: Re: [Ipsec] CCM: AAD construction
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At 1:30 PM -0700 4/6/05, Bansal, Yogesh wrote:
>	<SNIP>
>
>However, IPSec ESP mode states that encryption is done prior to
>authentication. Does this order change in the
>draft-ietf-ipsec-ciph-aes-ccm-05.txt, meaning that authentication is
>done after CTR-encryption? If so, is the CBC-MAC encrypted again.

look at ESP v3. drafts of this document have been around for quite a 
while. it has just been approved by the IESG and is now in the RFC 
Editor's hands. It has an explicit discussion of how to process 
packets when a combined mode algorithm (confidentiality and 
integrity) is employed.

Steve

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