Re: [TLS] draft-kato-tls-rfc4132bis-03
Alfred Hönes <ah@tr-sys.de> Fri, 27 February 2009 01:34 UTC
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From: Alfred Hönes <ah@tr-sys.de>
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To: kanno-s@po.ntts.co.jp, tls@ietf.org
Date: Fri, 27 Feb 2009 02:33:00 +0100
In-Reply-To: <20090226190948.335F.KANNO-S@po.ntts.co.jp> from Satoru Kanno at Feb "27, " 2009 "01:19:10" am
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Subject: Re: [TLS] draft-kato-tls-rfc4132bis-03
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Since the first revisions of draft-kato-tls-rfc4132bis, the collective wisdom in the TLS WG, the SEC area of the IETF, and at large, on proper mix & match of block cipher strenghts (measured in key size) and hash strength (measured in SHA-2 hash width) has evolved. The latest policy of the TLS WG was: a) that full AES-256 strength (corresponding to SHA-512) was not required in TLS for the foreseeable future, and a) to use the 'overshooting' AES-256 for the 192-bit security level (corresponding to SHA-384), in order to reduce the combinatorial complexity. Based on these principles, the common combinations have been AES-128 + SHA-256 and AES-256 + SHA-384 . This strategy has been followed in the TLS ciphersuite documents published in the recent past and currently in the RFC Editor Queue. Thus, it should be seriously considered to define a matching portfolio of properties in the Camellia-based family of TLS cipersuites. This would mean introducing SHA-384 in place of SHA-256 into the last group of 6 ciphersuites (those using Camellia-256) defined in the draft. Should we recommend the authors to undertake this step? Kind regards, Alfred. -- +------------------------+--------------------------------------------+ | TR-Sys Alfred Hoenes | Alfred Hoenes Dipl.-Math., Dipl.-Phys. | | Gerlinger Strasse 12 | Phone: (+49)7156/9635-0, Fax: -18 | | D-71254 Ditzingen | E-Mail: ah@TR-Sys.de | +------------------------+--------------------------------------------+
- [TLS] draft-kato-tls-rfc4132bis-03 Satoru Kanno
- Re: [TLS] draft-kato-tls-rfc4132bis-03 Nelson B Bolyard
- Re: [TLS] draft-kato-tls-rfc4132bis-03 Alfred Hönes
- Re: [TLS] draft-kato-tls-rfc4132bis-03 Satoru Kanno