Re: [openpgp] New fingerprint: to v5 or not to v5

Watson Ladd <watsonbladd@gmail.com> Thu, 01 October 2015 22:39 UTC

Return-Path: <watsonbladd@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 A58A11A8BC4 for <openpgp@ietfa.amsl.com>; Thu, 1 Oct 2015 15:39:14 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.101
X-Spam-Level:
X-Spam-Status: No, score=-0.101 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] 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 JTNPfJzH9R6L for <openpgp@ietfa.amsl.com>; Thu, 1 Oct 2015 15:39:13 -0700 (PDT)
Received: from mail-wi0-x235.google.com (mail-wi0-x235.google.com [IPv6:2a00:1450:400c:c05::235]) (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 D5FDF1A8AF9 for <openpgp@ietf.org>; Thu, 1 Oct 2015 15:39:12 -0700 (PDT)
Received: by wicfx3 with SMTP id fx3so10626804wic.1 for <openpgp@ietf.org>; Thu, 01 Oct 2015 15:39:11 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=vg8cfoT9yzhT/6fT+tzaLOiSwacNtqymAFA/hqXSlK8=; b=cxdtAUl3F5aunCj1K0rl/9ACmX7US72TsY3Ez74bmkoe0GGBHdjSAT1agvHYVMp2jx BrTLsA7Qbg6feeqi0gn1craCmU/uc1U0KEmBHOqnHajYTCawfAUmUpYqNN7f+/hzsaIT 0zx2wALFATEE4O6P3ODyR10PI3RQM8YofaS5R8sZ0FtBt29o5pi/jxNnBWfr4N47XnNt Gmqugwr7n3Xz/FHFD0+0nXO41diP9XaNkL6CD13FDpnJyO/FiAOdwiElQujfvom4PeXV U6v3bBmWNI+i5T0V/vtmprSEnIDQUA6MJscLJ3khnf+aU1+HDspaSPUuT2O+24U7j8RR b/nQ==
MIME-Version: 1.0
X-Received: by 10.194.250.40 with SMTP id yz8mr15182381wjc.37.1443739151429; Thu, 01 Oct 2015 15:39:11 -0700 (PDT)
Received: by 10.28.51.145 with HTTP; Thu, 1 Oct 2015 15:39:11 -0700 (PDT)
In-Reply-To: <87r3lgcup8.fsf@vigenere.g10code.de>
References: <878u84zy4r.fsf@vigenere.g10code.de> <87fv1xxe5w.fsf@alice.fifthhorseman.net> <87r3lgcup8.fsf@vigenere.g10code.de>
Date: Thu, 1 Oct 2015 18:39:11 -0400
Message-ID: <CACsn0c=-LKagSqTbgOV1W4Gu4u-f6vpVq82-nWSLGogjoeFKeg@mail.gmail.com>
From: Watson Ladd <watsonbladd@gmail.com>
To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>, IETF OpenPGP <openpgp@ietf.org>
Content-Type: text/plain; charset=UTF-8
Archived-At: <http://mailarchive.ietf.org/arch/msg/openpgp/rPZLIWgrVe0-FOPZIBd5XSSp5js>
Subject: Re: [openpgp] New fingerprint: to v5 or not to v5
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: Thu, 01 Oct 2015 22:39:14 -0000

On Wed, Sep 30, 2015 at 2:00 AM, Werner Koch <wk@gnupg.org>; wrote:
> On Tue, 29 Sep 2015 20:40, dkg@fifthhorseman.net said:
>
>> v4 key and wrap it in a v5 packet, thereby producing a "new key" that's
>> actually the "same key".  So claiming that key material can only be used
>> as *either* v4 or v5 wouldn't quite be correct.
>
> FWIW: I was thinking about this but that is not limited to OpenPGP.  I
> can use the same key material for an OpenPGP key, an X.509 key, and an
> SSH key.  This is actually sometimes useful if you have a single key on
> a smartcard.

Have you conducted a proper cross-protocol analysis of what data each
key type is used to sign showing that this interaction doesn't lead to
bad things happening?

>
>
> Salam-Shalom,
>
>    Werner
>
>
> --
> Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.
>
> _______________________________________________
> openpgp mailing list
> openpgp@ietf.org
> https://www.ietf.org/mailman/listinfo/openpgp



-- 
"Man is born free, but everywhere he is in chains".
--Rousseau.