Re: [openpgp] SHA3 algorithm ids.

Phillip Hallam-Baker <phill@hallambaker.com> Sun, 09 August 2015 01:40 UTC

Return-Path: <hallam@gmail.com>
X-Original-To: openpgp@ietfa.amsl.com
Delivered-To: openpgp@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A02C21A8A7B for <openpgp@ietfa.amsl.com>; Sat, 8 Aug 2015 18:40:55 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.277
X-Spam-Level:
X-Spam-Status: No, score=-1.277 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FM_FORGED_GMAIL=0.622, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] 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 75k-QswyVS9E for <openpgp@ietfa.amsl.com>; Sat, 8 Aug 2015 18:40:54 -0700 (PDT)
Received: from mail-la0-x22d.google.com (mail-la0-x22d.google.com [IPv6:2a00:1450:4010:c03::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C92A61A1AB2 for <openpgp@ietf.org>; Sat, 8 Aug 2015 18:40:53 -0700 (PDT)
Received: by labd1 with SMTP id d1so25302304lab.1 for <openpgp@ietf.org>; Sat, 08 Aug 2015 18:40:52 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=D8k1123quOmtpKys0nwZQTBVL7vZ6VfbL2ZExxkKvVU=; b=Ue5g4NArQeImCM8rFUXwOOTnPCQLi06M6jWh2oBc7oxD4845Z+QVDKkcfhjpHLpB39 h54laTABCnwz1HtU56u7bIcqUEjwW3b07gVSVwLYSZ7oaM8qTlBu4J6nNA7yElhe+eZM 244KWOcPrrMNEbC7j1Qa6bp1IbsoauOX1xftv9E8otqtqfnDwq49L+1qFrc4e/hNl1Wo 48X3Qk4knRUHZeWl9kB45bsJOuaDdZ9cHXoHKIYZTpT4t9NbLa1Pl4BuUuUTKndblLwu Leo5ZRVnqZhMvWo2b8BEPzTPqQnUiMBUTW0nPPMZ4Okopg/JXSFhETgmxibqy4bDp18M 2T4g==
MIME-Version: 1.0
X-Received: by 10.152.204.196 with SMTP id la4mr14881683lac.124.1439084452013; Sat, 08 Aug 2015 18:40:52 -0700 (PDT)
Sender: hallam@gmail.com
Received: by 10.112.203.163 with HTTP; Sat, 8 Aug 2015 18:40:51 -0700 (PDT)
In-Reply-To: <1439075830.20521.66.camel@scientia.net>
References: <835832901.20150808225230@gmail.com> <55C68729.3050603@iang.org> <1439075830.20521.66.camel@scientia.net>
Date: Sat, 08 Aug 2015 21:40:51 -0400
X-Google-Sender-Auth: MAHOPLu_tizKexGJyofTP7oLgN4
Message-ID: <CAMm+LwgY9S7KgwP5q2FSPrdaLpsQ1E7LOvsC5OOJTwy5ZWGODw@mail.gmail.com>
From: Phillip Hallam-Baker <phill@hallambaker.com>
To: Christoph Anton Mitterer <calestyo@scientia.net>
Content-Type: multipart/alternative; boundary="001a113499ce906d13051cd6f5c2"
Archived-At: <http://mailarchive.ietf.org/arch/msg/openpgp/FlqVS83IafRR39HoANE7TMH9lbQ>
Cc: IETF OpenPGP <openpgp@ietf.org>
Subject: Re: [openpgp] SHA3 algorithm ids.
X-BeenThere: openpgp@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "Ongoing discussion of OpenPGP issues." <openpgp.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/openpgp>, <mailto:openpgp-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/openpgp/>
List-Post: <mailto:openpgp@ietf.org>
List-Help: <mailto:openpgp-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/openpgp>, <mailto:openpgp-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 09 Aug 2015 01:40:55 -0000

Thinking this through a bit further.

Why is anyone going to move from SHA-2 to SHA-3 ? Only reason I can think
of is a real or perceived weakness in SHA-2.

That being so, I can't see why they would go for a lower number of
bits/rounds.

For OpenPGP, I think the case for 512 only or 256 and 512 is pretty strong.


On Sat, Aug 8, 2015 at 7:17 PM, Christoph Anton Mitterer <
calestyo@scientia.net> wrote:

> On Sat, 2015-08-08 at 23:48 +0100, ianG wrote:
> > My "position" is only one hash, as many know well.  I prefer the
> > longest, because they are computers and they don't have enough work
> > to
> > do.
> If only one is to be assigned a number, it should be definitely the
> longest.
>
> Cheers,
> Chris.
> _______________________________________________
> openpgp mailing list
> openpgp@ietf.org
> https://www.ietf.org/mailman/listinfo/openpgp
>
>