Re: [TLS] Fw: New Version Notification for draft-katagi-tls-clefia-00.txt

 Hi there,

I would suggest to think about another hashing algorithm because there
is at least one theoretical attack on SHA-1.

What about SHA-2 (256 or eve 512)?

Regards,
Andre

Am 05.07.2011 05:00, schrieb Satoru Kanno:
> Hi Masanobu,
>
> I have two comments for your draft.
>
> [For IPR statement]
> I can't find an IPR statement on CLEFIA for TLS when searching for
> that draft on the IPR Disclosure search page:
>
> https://datatracker.ietf.org/ipr/search/?option=document_search&document_search=draft-katagi-tls-clefia
>
>
> In the case of Camellia, we submitted the IPR statement for TLS as a
> following:
>
> https://datatracker.ietf.org/ipr/41/
>
> Since CLEFIA is patented by SONY, I believe you need to submit an IPR
> 　 disclosure for this document.
>
>
> [For ciphersuites with SHA-1]
> Are you really suggesting that CLEFIA be used with SHA-1?
> NIST is saying not to use SHA-1 very soon. I believe these suites
> should be removed because RFC 6209 and new I-D on Camellia are not
> defined on these suites recently.
> Of course, I checked security considerations for ciphersuites with
> SHA-1 in your draft.
>
> What do you and TLS folks think of these ciphersuites?
>
> Regards,
> Satoru
>
> (2011/07/05 9:33), Masanobu Katagi wrote:
>> Dear all,
>>
>> We have submitted the Internet draft that defines cipher suites to
>> support CLEFIA in TLS.
>> http://tools.ietf.org/id/draft-katagi-tls-clefia-00.txt
>>
>> CLEFIA is a 128-bit block cipher presented at FSE2007 and it is now
>> used in commercial products.
>> The algorithm of CLEFIA was published as RFC6114 in March 2011.
>> CLEFIA is a lightweight block cipher compared with AES, Camellia, and
>> SEED.
>> We believe that CLEFIA will contribute to the Internet of Things as a
>> lightweight cipher algorithm.
>>
>> The security and performance of CLEFIA have been evaluated through
>> the CRYPTREC project
>> which evaluates and monitors the security of Japan e-Government
>> recommended ciphers.
>> It also has been submitted to the ISO/IEC standard (ISO/IEC 29192,
>> Lightweight cryptography) and it's
>> in the Final Draft International Standard.
>>
>> Any comments on this draft would be appreciated.
>>
>> Best regards,
>> Masanobu Katagi
>> Sony Corporation
>>
>> Forwarded by Masanobu Katagi<Masanobu.Katagi@jp.sony.com>
>> ----------------------- Original Message -----------------------
>>   From:    "internet-drafts@ietf.org"<internet-drafts@ietf.org>
>>   To:      "Katagi, Masanobu"<Masanobu.Katagi@jp.sony.com>
>>   Cc:      "Katagi, Masanobu"<Masanobu.Katagi@jp.sony.com>,
>>            "Moriai, Shiho"<Shiho.Moriai@jp.sony.com>
>>   Date:    Mon, 4 Jul 2011 17:51:44 +0900
>>   Subject: New Version Notification for draft-katagi-tls-clefia-00.txt
>> ----
>>
>> A new version of I-D, draft-katagi-tls-clefia-00.txt has been
>> successfully submitted by Masanobu Katagi and posted to the IETF
>> repository.
>>
>> Filename:     draft-katagi-tls-clefia
>> Revision:     00
>> Title:         CLEFIA Cipher Suites for Transport Layer Security (TLS)
>> Creation date:     2011-07-04
>> WG ID:         Individual Submission
>> Number of pages: 16
>>
>> Abstract:
>>     This document specifies a set of cipher suites for the Transport
>>     Security Layer (TLS) protocol to support the CLEFIA encryption
>>     algorithm as a block cipher.  CLEFIA is a lightweight block cipher
>>     and suitable for constrained devices.
>>
>>
>>
>>
>> The IETF Secretariat
>>
>>
>> --------------------- Original Message Ends --------------------
>>
>>
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>
>