Re: [Cfrg] On the use of Montgomery form curves for key agreement

Stephen Farrell <stephen.farrell@cs.tcd.ie> Tue, 02 September 2014 15:39 UTC

Return-Path: <stephen.farrell@cs.tcd.ie>
X-Original-To: cfrg@ietfa.amsl.com
Delivered-To: cfrg@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 953911A0AA3 for <cfrg@ietfa.amsl.com>; Tue, 2 Sep 2014 08:39:52 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.568
X-Spam-Level:
X-Spam-Status: No, score=-2.568 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RP_MATCHES_RCVD=-0.668] autolearn=ham
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 ayr0FZe4-QhM for <cfrg@ietfa.amsl.com>; Tue, 2 Sep 2014 08:39:51 -0700 (PDT)
Received: from mercury.scss.tcd.ie (mercury.scss.tcd.ie [134.226.56.6]) by ietfa.amsl.com (Postfix) with ESMTP id 2B7111A6EFA for <cfrg@ietf.org>; Tue, 2 Sep 2014 08:39:51 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by mercury.scss.tcd.ie (Postfix) with ESMTP id 86717BE88; Tue, 2 Sep 2014 16:39:50 +0100 (IST)
X-Virus-Scanned: Debian amavisd-new at scss.tcd.ie
Received: from mercury.scss.tcd.ie ([127.0.0.1]) by localhost (mercury.scss.tcd.ie [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lRTGmLLCBdyj; Tue, 2 Sep 2014 16:39:49 +0100 (IST)
Received: from [10.87.48.9] (unknown [86.42.23.36]) by mercury.scss.tcd.ie (Postfix) with ESMTPSA id 4A235BE83; Tue, 2 Sep 2014 16:39:49 +0100 (IST)
Message-ID: <5405E4C5.60107@cs.tcd.ie>
Date: Tue, 02 Sep 2014 16:39:49 +0100
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0
MIME-Version: 1.0
To: Watson Ladd <watsonbladd@gmail.com>
References: <e16ac4926a934565a65456058e50b68e@BL2PR03MB242.namprd03.prod.outlook.com> <CALCETrUby2o5O3=tMkv20JTVkahSo5Wan4oSCPOspRnXhFCg+g@mail.gmail.com> <b53e2c5417d247199f4496e0c0d5c29c@BL2PR03MB242.namprd03.prod.outlook.com> <CACsn0cktxTyPpeaqKU-oL+DiP4Fu0risHB1Wx8-by+94s30h=g@mail.gmail.com> <CA+Vbu7yMvyPzRAGrtVH38mzaYy3XQ1wswEUQisqbwpT10JfQVg@mail.gmail.com> <54058021.9040801@cs.tcd.ie> <CACsn0c=XV4bQSa7Oh3=s+JvFpJdT3Lm16wQHRG2ACEjxuU-dvg@mail.gmail.com> <5405E343.7010302@cs.tcd.ie> <CACsn0c=SRzDGU7qmDqNeysL82dH+E4Y9gmOfpbXb3AZj7Bo5qg@mail.gmail.com>
In-Reply-To: <CACsn0c=SRzDGU7qmDqNeysL82dH+E4Y9gmOfpbXb3AZj7Bo5qg@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Archived-At: http://mailarchive.ietf.org/arch/msg/cfrg/F-3d-vbf6c2csMkYoBvTe2LRssI
Cc: "cfrg@ietf.org" <cfrg@ietf.org>
Subject: Re: [Cfrg] On the use of Montgomery form curves for key agreement
X-BeenThere: cfrg@irtf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Crypto Forum Research Group <cfrg.irtf.org>
List-Unsubscribe: <http://www.irtf.org/mailman/options/cfrg>, <mailto:cfrg-request@irtf.org?subject=unsubscribe>
List-Archive: <http://www.irtf.org/mail-archive/web/cfrg/>
List-Post: <mailto:cfrg@irtf.org>
List-Help: <mailto:cfrg-request@irtf.org?subject=help>
List-Subscribe: <http://www.irtf.org/mailman/listinfo/cfrg>, <mailto:cfrg-request@irtf.org?subject=subscribe>
X-List-Received-Date: Tue, 02 Sep 2014 15:39:52 -0000


On 02/09/14 16:37, Watson Ladd wrote:
> *None* of the arguments advanced so far help with picking new curves.
> What possible difference is there between NUMS and the DJB/Tanja
> curves? None, because you can always put one in the form of the other.
> The only solution is a coinflip.

Well, that's well beyond the scope of my teeny weeny comment:-)

S.