Re: [openpgp] Disabling compression in OpenPGP
Florian Weimer <fw@deneb.enyo.de> Wed, 19 March 2014 16:56 UTC
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From: Florian Weimer <fw@deneb.enyo.de>
To: Jon Callas <jon@callas.org>
References: <CALR0uiJG6GcngWMUkg6NrP7_4uwf8+QDn6aMF-qonOpRMLdo3w@mail.gmail.com> <95BD0817-D762-41DD-8444-A0C4F7AF1003@jabberwocky.com> <CALR0uiL0-Xp8E=F3idtzBkmRNLk7K_M_cqMt+i2HdNqaNkwn=w@mail.gmail.com> <849778F8-1C16-4FF8-A039-6363C158BD1F@callas.org>
Date: Wed, 19 Mar 2014 17:56:39 +0100
In-Reply-To: <849778F8-1C16-4FF8-A039-6363C158BD1F@callas.org> (Jon Callas's message of "Wed, 19 Mar 2014 09:43:07 -0700")
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Cc: David Shaw <dshaw@jabberwocky.com>, openpgp@ietf.org, Alfredo Pironti <alfredo.pironti@inria.fr>
Subject: Re: [openpgp] Disabling compression in OpenPGP
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* Jon Callas: > In specific cases, *flaws* in this conversion when combined with an > interactive protocol can lead to an attack that is in general, not > applicable to a non-interactive protocol with large amounts of > compressed data. It doesn't have to be interactive (in the sense of chosen-something attacks). For example, lossy voice compression tends to produce length differences for different phonemes. And the Wikimedia example wasn't something interactive, either. > But in general, this benefits the defender, as the attacker has no > idea what the *actual* plaintext is (the compressed data) unless > they know the base plaintext is, and small inaccuracies in the > attackers guess lead to large differences. But this doesn't matter if the encryption is sound, does it?
- [openpgp] Disabling compression in OpenPGP Alfredo Pironti
- Re: [openpgp] Disabling compression in OpenPGP Gregory Maxwell
- Re: [openpgp] Disabling compression in OpenPGP Simon Josefsson
- Re: [openpgp] Disabling compression in OpenPGP Alfredo Pironti
- Re: [openpgp] Disabling compression in OpenPGP Jon Callas
- Re: [openpgp] Disabling compression in OpenPGP David Shaw
- Re: [openpgp] Disabling compression in OpenPGP Andrey Jivsov
- Re: [openpgp] Disabling compression in OpenPGP Alfredo Pironti
- Re: [openpgp] Disabling compression in OpenPGP Jon Callas
- Re: [openpgp] Disabling compression in OpenPGP Florian Weimer
- Re: [openpgp] Disabling compression in OpenPGP Alfredo Pironti
- Re: [openpgp] Disabling compression in OpenPGP Peter Todd
- Re: [openpgp] Disabling compression in OpenPGP Jon Callas
- Re: [openpgp] Disabling compression in OpenPGP Peter Todd
- Re: [openpgp] Disabling compression in OpenPGP Gregory Maxwell
- Re: [openpgp] Disabling compression in OpenPGP Jon Callas
- Re: [openpgp] Disabling compression in OpenPGP Peter Todd
- Re: [openpgp] Disabling compression in OpenPGP Gregory Maxwell
- Re: [openpgp] Disabling compression in OpenPGP Jon Callas
- Re: [openpgp] Disabling compression in OpenPGP ianG
- Re: [openpgp] Disabling compression in OpenPGP Peter Todd
- Re: [openpgp] Disabling compression in OpenPGP Gregory Maxwell
- Re: [openpgp] Disabling compression in OpenPGP Nicholas Cole
- Re: [openpgp] Disabling compression in OpenPGP Werner Koch
- Re: [openpgp] Disabling compression in OpenPGP Alfredo Pironti
- Re: [openpgp] Disabling compression in OpenPGP Werner Koch
- Re: [openpgp] Disabling compression in OpenPGP ianG
- Re: [openpgp] Disabling compression in OpenPGP Alfredo Pironti
- Re: [openpgp] Disabling compression in OpenPGP ianG
- Re: [openpgp] Disabling compression in OpenPGP ianG
- Re: [openpgp] Disabling compression in OpenPGP Hauke Laging
- Re: [openpgp] Disabling compression in OpenPGP Gregory Maxwell