IETF Logo Mail Archive

Re: [openpgp] OpenPGP encryption block modes (Was: The Argon2 proposal seems incomplete (Draft 6))

Marcus Brinkmann <marcus.brinkmann@rub.de> Mon, 08 August 2022 19:19 UTC

Return-Path: <marcus.brinkmann@rub.de>
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 F2061C147921 for <openpgp@ietfa.amsl.com>; Mon, 8 Aug 2022 12:19:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -7.107
X-Spam-Level:
X-Spam-Status: No, score=-7.107 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, URIBL_BLOCKED=0.001, URIBL_DBL_BLOCKED_OPENDNS=0.001, URIBL_ZEN_BLOCKED_OPENDNS=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=rub.de
Received: from mail.ietf.org ([50.223.129.194]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id S-B7LDI-DeZH for <openpgp@ietfa.amsl.com>; Mon, 8 Aug 2022 12:19:19 -0700 (PDT)
Received: from out2.mail.ruhr-uni-bochum.de (out2.mail.ruhr-uni-bochum.de [134.147.42.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AC671C14CF0A for <openpgp@ietf.org>; Mon, 8 Aug 2022 12:19:19 -0700 (PDT)
Received: from mx2.mail.ruhr-uni-bochum.de (localhost [127.0.0.1]) by out2.mail.ruhr-uni-bochum.de (Postfix mo-ext) with ESMTP id 4M1mGX5FW7z8TvS for <openpgp@ietf.org>; Mon, 8 Aug 2022 21:19:16 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rub.de; s=mail-2017; t=1659986356; bh=2Sa/V+gxCi3VdTs4hQWjTmJsabOaytH+0FenJoFL89w=; h=From:Subject:Date:References:To:In-Reply-To:From; b=Oi4GMDnRcS+pw4BRThCP0BAnyltg4Nzkom7xtPmES9I2ySOzMHyfBHo5Bfin1nOKS /mrDHK6JfSc7Wb185c+NuyyygjTwuSAUAyLB2+13faQ5usKG9MYTA8O/ibd1e7mW2n hs8ms4Hvcd9YRMBC1o+B/tzBNpsHIb+xS0ppwG+Q=
Received: from out2.mail.ruhr-uni-bochum.de (localhost [127.0.0.1]) by mx2.mail.ruhr-uni-bochum.de (Postfix idis) with ESMTP id 4M1mGX4YF2z8TtD for <openpgp@ietf.org>; Mon, 8 Aug 2022 21:19:16 +0200 (CEST)
X-Envelope-Sender: <marcus.brinkmann@rub.de>
X-RUB-Notes: Internal origin=134.147.42.236
Received: from mail2.mail.ruhr-uni-bochum.de (mail2.mail.ruhr-uni-bochum.de [134.147.42.236]) by out2.mail.ruhr-uni-bochum.de (Postfix mi-int) with ESMTP id 4M1mGX3CWqz8Tw8 for <openpgp@ietf.org>; Mon, 8 Aug 2022 21:19:16 +0200 (CEST)
X-Virus-Status: Clean
X-Virus-Scanned: clamav-milter 0.104.1 at mx2.mail.ruhr-uni-bochum.de
Received: from smtpclient.apple (p5dca454f.dip0.t-ipconnect.de [93.202.69.79]) by mail2.mail.ruhr-uni-bochum.de (Postfix) with ESMTPSA id 4M1mGX1ftGzDgyN for <openpgp@ietf.org>; Mon, 8 Aug 2022 21:19:16 +0200 (CEST)
X-Virus-Status: Clean
X-Virus-Scanned: clamav-milter 0.104.2 at mail2.mail.ruhr-uni-bochum.de
From: Marcus Brinkmann <marcus.brinkmann@rub.de>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\))
Date: Mon, 08 Aug 2022 21:19:15 +0200
References: <YuAErZRsF/KbOw1s@watt.59.ca> <87edy7keb6.fsf@thinkbox> <YuFc+w02FiRQmHcg@watt.59.ca> <87bktajjvq.fsf@thinkbox> <YuKpxp0/Dy1DfC19@watt.59.ca> <875yjhjg2c.fsf@thinkbox> <87r124m64c.fsf@wheatstone.g10code.de> <YulX9jI1+wOCwLJq@ohm.59.ca>
To: openpgp@ietf.org
In-Reply-To: <YulX9jI1+wOCwLJq@ohm.59.ca>
Message-Id: <845A0B33-D115-4BA7-BD4D-ED76B72E0EB3@rub.de>
X-Mailer: Apple Mail (2.3693.60.0.1.1)
Archived-At: <https://mailarchive.ietf.org/arch/msg/openpgp/4LjfMRKw2kpqi-NvJMrenK99lm8>
Subject: Re: [openpgp] OpenPGP encryption block modes (Was: The Argon2 proposal seems incomplete (Draft 6))
X-BeenThere: openpgp@ietf.org
X-Mailman-Version: 2.1.39
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, 08 Aug 2022 19:19:25 -0000

> Am 02.08.2022 um 18:59 schrieb Bruce Walzer <bwalzer@59.ca>:
> AEAD isn't even a very accurate term in an OpenPGP context. There is
> no AD (associated data) exposed to the user of such a system. It just
> doesn't work that way.

It would be very useful to expose AD in OpenPGP to users to prevent exfiltration attacks in the context of email. See our research at [1].

Thanks,
Marcus

[1] Jörg Schwenk, Marcus Brinkmann, Damian Poddebniak, Jens Müller, Juraj Somorovsky, and Sebastian Schinzel. 2020. Mitigation of Attacks on Email End-to-End Encryption. In Proceedings of the 2020 ACM SIGSAC Conference on Computer and Communications Security (CCS '20). Association for Computing Machinery, New York, NY, USA, 1647–1664. https://doi.org/10.1145/3372297.3417878

Preprint available here: https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/12/06/schwenk2020.pdf

—
Dipl.-Math. Marcus Brinkmann

Lehrstuhl für Netz- und Datensicherheit
Ruhr Universität Bochum
Universitätsstr. 150, Geb. ID 2/461
D-44780 Bochum

Telefon: +49 (0) 234 / 32-25030
http://www.nds.rub.de/chair/people/mbrinkmann

v2.23.0 | Report a Bug | By Email