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

Satoru Kanno <kanno.satoru@po.ntts.co.jp> Tue, 05 July 2011 03:01 UTC

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Date: Tue, 05 Jul 2011 12:00:46 +0900
From: Satoru Kanno <kanno.satoru@po.ntts.co.jp>
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Cc: shiho.moriai@jp.sony.com, tls@ietf.org
Subject: Re: [TLS] Fw: New Version Notification for draft-katagi-tls-clefia-00.txt
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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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> https://www.ietf.org/mailman/listinfo/tls
>


-- 
Satoru Kanno

Security Business Unit
Mobile and Security Solution Business Group
NTT Software Corporation

e-mail: kanno.satoru@po.ntts.co.jp