Re: [Cfrg] draft-housley-ccm-mode-00.txt
Gé Weijers <Ge.Weijers@Sun.COM> Fri, 16 August 2002 16:55 UTC
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Date: Fri, 16 Aug 2002 09:51:06 -0700
From: Gé Weijers <Ge.Weijers@Sun.COM>
Subject: Re: [Cfrg] draft-housley-ccm-mode-00.txt
To: David Wagner <daw@mozart.cs.berkeley.edu>
Cc: cfrg@ietf.org
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References: <200208160411.QAA18674@ruru.cs.auckland.ac.nz> <ajip36$538$1@abraham.cs.berkeley.edu>
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David Wagner wrote: >Can you elaborate? What advantages do you see for CCM over >the standard encrypt-then-authenticate generic composition of >AES-CBC encryption and AES-CBC-MAC (suitably modified to be >secure for variable-length messages)? The latter is unencumbered >and has the same performance characteristics as CCM. > An advantage I can see is the use of the same key for both authentication and encryption. I'm not aware of any proof of security for an encrypt-then-authenticate design that holds up when you use the same key for both encryption and authentication. Using the same key halves the key storage requirements for an 802.11 base station.. CCM tries to ensure that the likelihood of collisions follows the usual birthday bound curve, and the article claims that encrypting the MAC value makes analysis of the MAC value impossible. The proof of security will make for an interesting read. Gé _______________________________________________ Cfrg mailing list Cfrg@ietf.org https://www1.ietf.org/mailman/listinfo/cfrg
- [Cfrg] draft-housley-ccm-mode-00.txt Housley, Russ
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Greg Rose
- Re: [Cfrg] draft-housley-ccm-mode-00.txt David Wagner
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Housley, Russ
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Greg Rose
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Peter Gutmann
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Peter Gutmann
- Re: [Cfrg] draft-housley-ccm-mode-00.txt David Wagner
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Housley, Russ
- RE: [Cfrg] draft-housley-ccm-mode-00.txt David A. Mcgrew
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Gé Weijers
- Re: [Cfrg] draft-housley-ccm-mode-00.txt David Wagner
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Gé Weijers
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Uri Blumenthal
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Housley, Russ
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Peter Gutmann
- Re: [Cfrg] draft-housley-ccm-mode-00.txt Carl Ellison
- [Cfrg] Re: draft-housley-ccm-mode-00.txt Housley, Russ