Re: [TLS] AAED ciphers: AES-GCM vs AES-EAX/AES-CCM: a meta-analysis

Michael Clark <michael@metaparadigm.com> Wed, 14 January 2015 12:03 UTC

Return-Path: <michael@metaparadigm.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 210D61B2C79 for <tls@ietfa.amsl.com>; Wed, 14 Jan 2015 04:03:10 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.458
X-Spam-Level:
X-Spam-Status: No, score=-1.458 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, IP_NOT_FRIENDLY=0.334, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_DKIM_INVALID=0.01] autolearn=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FjyIlQP3k3R1 for <tls@ietfa.amsl.com>; Wed, 14 Jan 2015 04:03:09 -0800 (PST)
Received: from tlsx.org (tlsx.org [67.207.128.90]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D71251B2C78 for <tls@ietf.org>; Wed, 14 Jan 2015 04:03:08 -0800 (PST)
Received: from monty.local (unknown.maxonline.com.sg [58.182.90.50] (may be forged)) (authenticated bits=0) by tlsx.org (8.14.4/8.14.4/Debian-4) with ESMTP id t0ECOium001065 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Wed, 14 Jan 2015 12:24:47 GMT
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=metaparadigm.com; s=klaatu; t=1421238289; bh=S/2FIIZypdQSd5/zSTK5kw93qo1H0fEur1SjzHI1QjY=; h=Date:From:To:CC:Subject:References:In-Reply-To:From; b=Q4xV/0DimQG0csadmmSf8BC5qL/oHgCpQaKEaq57LoNlymHbk6dSKk0RBM8Ukt3nb CnzvGeKiRG14xbrM6wNhTZbooh3yxyBNvVdQWEH5dmbTa9H78gFRwquNJBn+lBCa6/ hHQv1l4/Czn8dYNNFx5seFztWBeRRathKYmRmrYw=
Message-ID: <54B65AF0.1080503@metaparadigm.com>
Date: Wed, 14 Jan 2015 20:02:56 +0800
From: Michael Clark <michael@metaparadigm.com>
Organization: Metaparadigm
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.3.0
MIME-Version: 1.0
To: Martin Thomson <martin.thomson@gmail.com>, Watson Ladd <watsonbladd@gmail.com>
References: <9A043F3CF02CD34C8E74AC1594475C73AAF525B9@uxcn10-tdc05.UoA.auckland.ac.nz> <D0D16976.3BD1D%kenny.paterson@rhul.ac.uk> <54B54A5F.7020401@polarssl.org> <D0DB0820.3C588%kenny.paterson@rhul.ac.uk> <CACsn0c=oYuUhkPi2QO=qPy95X4v+xXViTyi+XzyRrO1BKLnnLg@mail.gmail.com> <D0DB1039.3C5D9%kenny.paterson@rhul.ac.uk> <CACsn0ck-2_348SkASvkCrP7r3HoD-G8t590WRzWkQpj6TjBMqg@mail.gmail.com> <CABkgnnWLUsKuJ71dbpSps5bErbrjGnYe-_BjDpJGmMkD-O0BUw@mail.gmail.com>
In-Reply-To: <CABkgnnWLUsKuJ71dbpSps5bErbrjGnYe-_BjDpJGmMkD-O0BUw@mail.gmail.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 8bit
X-Virus-Scanned: clamav-milter 0.98.4 at klaatu.metaparadigm.com
X-Virus-Status: Clean
Archived-At: <http://mailarchive.ietf.org/arch/msg/tls/cUfpKB0OTykLLnGRHOsw1AeCIf4>
Cc: =?windows-1252?Q?Manuel_P=E9gouri=E9-Gonnard?= <mpg@polarssl.org>, "<tls@ietf.org>" <tls@ietf.org>
Subject: Re: [TLS] AAED ciphers: AES-GCM vs AES-EAX/AES-CCM: a meta-analysis
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." <tls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tls>, <mailto:tls-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/tls/>
List-Post: <mailto:tls@ietf.org>
List-Help: <mailto:tls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tls>, <mailto:tls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 14 Jan 2015 12:03:10 -0000

On 14/1/15 2:32 am, Martin Thomson wrote:
> On 13 January 2015 at 10:23, Watson Ladd <watsonbladd@gmail.com>; wrote:
>>> https://tools.ietf.org/html/draft-pironti-tls-length-hiding-01 would be a
>>> good starting point, no?
>>
>> Seem to be, although I don't remember it being discussed on the list
>> before. We should fix this problem.
> 
> 
> We discussed it at some length at a meeting (Denver).  There was
> significant interest in doing this, though I think we agreed that we
> had to sort out a few things before the time was right.
> 
> See also https://github.com/tlswg/tls13-spec/issues/69

Interesting. Should draft-pironti-tls-length-hiding-01 be added to
Related Active Documents (not working group documents) section here:

    https://tools.ietf.org/wg/tls/

Michael