Article View: de.comp.os.unix.linux.misc
Article #78Re: Watermark attack, war Re: Loopback Verschluesselung unter SuSE 9.2
From: Helmut Zeisel
Date: Thu, 20 Jan 2005 09:49
Date: Thu, 20 Jan 2005 09:49
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Helmut Zeisel wrote:
> Sovweit ich es verstehe, geht es um "watermark" Attacken. Wenn ich es
> richtig verstehe, geht es hier um eine "known plaintext" Attacke.
> Gewisse "magic numbers" im Linux-Dateisystem sind bekannt, man wei�
> genau, wo sich diese Werte im verschluesselten Dateisystem befinden und
> kann dadurch die Brute-Force-Attacken erleichtern.
>
> Kann das wer best�tigen oder genauer erkl�ren?
Da habe ich noch was gefunden:
Watermark-attack ist also keine known-plaintext, sondern
chosen-plaintext Attacke.
http://marc.theaimsgroup.com/?l=linux-kernel&m=107719798631935&w=
List: linux-kernel
Subject: Re: Oopsing cryptoapi (or loop device?) on 2.6.*
From: Jari Ruusu <jariruusu () users ! sourceforge ! net>
Date: 2004-02-19 13:34:54
Message-ID: <4034BB7E.4ED20C2 () users ! sourceforge ! net>
Markku-Juhani O. Saarinen discovered watermark attack against
cryptoloop, here is his paper:
http://www.tcs.hut.fi/~mjos/doc/diskenc.pdf
This attack makes it possible to detect presense of specially crafted
watermarked files, such as, unreleased Hollywood movies, cruise missile
service manuals, and other content that you did not create yourself.
Watermarked files contain special bit patterns that can be detected
without decryption.
Helmut
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