IETF Logo Mail Archive

Re: [openpgp] Followup on fingerprints

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Tue, 04 August 2015 21:12 UTC

Return-Path: <dkg@fifthhorseman.net>
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 C92221AC44C for <openpgp@ietfa.amsl.com>; Tue, 4 Aug 2015 14:12:46 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] 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 0vIS4M3CV6fP for <openpgp@ietfa.amsl.com>; Tue, 4 Aug 2015 14:12:45 -0700 (PDT)
Received: from che.mayfirst.org (che.mayfirst.org [209.234.253.108]) by ietfa.amsl.com (Postfix) with ESMTP id 50D3A1AC431 for <openpgp@ietf.org>; Tue, 4 Aug 2015 14:12:45 -0700 (PDT)
Received: from fifthhorseman.net (unknown [38.109.115.130]) by che.mayfirst.org (Postfix) with ESMTPSA id 715B3F984; Tue, 4 Aug 2015 17:12:42 -0400 (EDT)
Received: by fifthhorseman.net (Postfix, from userid 1000) id 39BB3202A2; Tue, 4 Aug 2015 23:12:32 +0200 (CEST)
From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: Phillip Hallam-Baker <phill@hallambaker.com>, Vincent Breitmoser <look@my.amazin.horse>
In-Reply-To: <CAMm+LwgTnommNMK63vhd4H+LHdGSnvhkgow2-QSMbcYEfUTUEg@mail.gmail.com>
References: <87twsn2wcz.fsf@vigenere.g10code.de> <CAMm+LwgRJX-SvydmpUAJMmN3yysi4zzGSpO2yY4JAMhD-9xLgQ@mail.gmail.com> <87zj2ecmv8.fsf@alice.fifthhorseman.net> <CAMm+LwgKmcTes=V7uS3MjCQixWCo-i7PY=VE7eCHSqt3Ho3OSg@mail.gmail.com> <87a8udd4u6.fsf@alice.fifthhorseman.net> <sjm61503182.fsf@securerf.ihtfp.org> <CAMm+LwgEVySpfL-iN2uzX-4tu7R+isDkHE9D8uAeLTxxd4VxqQ@mail.gmail.com> <sjmwpxc1kbv.fsf@securerf.ihtfp.org> <CAAS2fgR6LYck+km5Ze6S9z65ZgsR61d8md2CqojDaceZ0OrZrw@mail.gmail.com> <9c2c8c5df67c83925d7e3c21fe943483.squirrel@mail2.ihtfp.org> <20150803173231.GG3067@straylight.m.ringlet.net> <2439a89a6c4eb70044e144406a732482.squirrel@mail2.ihtfp.org> <87io8v7uqt.fsf@littlepip.fritz.box> <87h9of7p0e.fsf@littlepip.fritz.box> <CAMm+LwgTnommNMK63vhd4H+LHdGSnvhkgow2-QSMbcYEfUTUEg@mail.gmail.com>
User-Agent: Notmuch/0.20.2 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-pc-linux-gnu)
Date: Tue, 04 Aug 2015 17:12:32 -0400
Message-ID: <878u9q4v27.fsf@alice.fifthhorseman.net>
MIME-Version: 1.0
Content-Type: text/plain
Archived-At: <http://mailarchive.ietf.org/arch/msg/openpgp/0Yx0OoO1eSM7IPLRaA1HRwJ_WfE>
Cc: IETF OpenPGP <openpgp@ietf.org>
Subject: Re: [openpgp] Followup on fingerprints
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: Tue, 04 Aug 2015 21:12:46 -0000

On Mon 2015-08-03 23:32:15 -0400, Phillip Hallam-Baker wrote:
> The attack is to confuse someone's perl hack into letting someone get away
> with something they should not.

This seems like an insufficiently specified attack to me.  The same
"someone" controls both (fingerprint-collided) keys anyway, so even if
there's a "perl hack" involved, that someone is already authorized,
right?

can you please describe a more detailed attack scenario?

    --dkg

v2.23.0 | Report a Bug | By Email