Re: [openpgp] v5 in the crypto-refresh draft

Michael Richardson <mcr+ietf@sandelman.ca> Mon, 07 June 2021 12:23 UTC

Return-Path: <mcr+ietf@sandelman.ca>
X-Original-To: openpgp@ietfa.amsl.com
Delivered-To: openpgp@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D34C33A138E for <openpgp@ietfa.amsl.com>; Mon, 7 Jun 2021 05:23:58 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.199
X-Spam-Level:
X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=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 fu4F0lrLwQHS for <openpgp@ietfa.amsl.com>; Mon, 7 Jun 2021 05:23:54 -0700 (PDT)
Received: from tuna.sandelman.ca (tuna.sandelman.ca [IPv6:2607:f0b0:f:3:216:3eff:fe7c:d1f3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DE3543A137D for <openpgp@ietf.org>; Mon, 7 Jun 2021 05:23:53 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by tuna.sandelman.ca (Postfix) with ESMTP id 6D31038D4D; Mon, 7 Jun 2021 08:24:31 -0400 (EDT)
Received: from tuna.sandelman.ca ([127.0.0.1]) by localhost (localhost [127.0.0.1]) (amavisd-new, port 10024) with LMTP id nK38MPasXujx; Mon, 7 Jun 2021 08:24:26 -0400 (EDT)
Received: from sandelman.ca (obiwan.sandelman.ca [209.87.249.21]) by tuna.sandelman.ca (Postfix) with ESMTP id 7DE5338D4C; Mon, 7 Jun 2021 08:24:26 -0400 (EDT)
Received: from localhost (localhost [IPv6:::1]) by sandelman.ca (Postfix) with ESMTP id 67F9D5E6; Mon, 7 Jun 2021 08:23:46 -0400 (EDT)
From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
cc: openpgp@ietf.org
In-Reply-To: <87mts3qbpn.fsf@fifthhorseman.net>
References: <87lf7q6sh0.fsf@fifthhorseman.net> <376548.1622830236@dooku> <87v96sqke0.fsf@fifthhorseman.net> <14974.1622924947@localhost> <87mts3qbpn.fsf@fifthhorseman.net>
X-Mailer: MH-E 8.6+git; nmh 1.7+dev; GNU Emacs 26.1
X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m<nPbLgmtKK-5dC@#:k
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature"
Date: Mon, 07 Jun 2021 08:23:46 -0400
Message-ID: <6181.1623068626@localhost>
Archived-At: <https://mailarchive.ietf.org/arch/msg/openpgp/n-fTeffp7M8lA3h-jjdcqaWT4I4>
Subject: Re: [openpgp] v5 in the crypto-refresh draft
X-BeenThere: openpgp@ietf.org
X-Mailman-Version: 2.1.29
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: Mon, 07 Jun 2021 12:23:59 -0000

Daniel Kahn Gillmor <dkg@fifthhorseman.net> wrote:
    > Each "key signature" (certification) is its own OpenPGP packet, right?
    > and the context we're talking about here is a hash context that is used
    > to calculate a key signature.

yes, but I'm assuming that we might sign these new keys using legacy signatures.
(and vv)

    >> A v5-capable tool, which does not speak these new formats can still process
    >> the packets.  It could also verify that these large keys are signed by our
    >> legacy algorithms.

    > yes, i agree with this, though it is not "skipping over" -- it's
    > "preparing for certifications of larger keys".

Agreed.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide