From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266364AbUG0IxO (ORCPT ); Tue, 27 Jul 2004 04:53:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266370AbUG0IxN (ORCPT ); Tue, 27 Jul 2004 04:53:13 -0400 Received: from waste.org ([209.173.204.2]:61057 "EHLO waste.org") by vger.kernel.org with ESMTP id S266364AbUG0IxM (ORCPT ); Tue, 27 Jul 2004 04:53:12 -0400 Date: Tue, 27 Jul 2004 03:53:09 -0500 From: Matt Mackall To: Junio C Hamano Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] Delete cryptoloop Message-ID: <20040727085309.GB18675@waste.org> References: <20040726200126.GQ5414@waste.org> <7v4qntc06o.fsf@assigned-by-dhcp.cox.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7v4qntc06o.fsf@assigned-by-dhcp.cox.net> User-Agent: Mutt/1.3.28i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 27, 2004 at 01:40:47AM -0700, Junio C Hamano wrote: > >>>>> "MM" == Matt Mackall writes: > > MM> Here's a scenario: corrupt government agency secretly watermarks > MM> incriminating documents. Brave whistleblower puts them on his laptop's > MM> cryptoloop fs, but gets taken aside by customs agents on his way out > MM> of the country. Agents check his disk for evidence of the watermark > MM> and find enough evidence... > > Jari's exploit uses the property that his watermarks are > encrypted to identical ciphertext blocks, but does it mean that > the technique can be used to prove that identical ciphertext are > from the watermarks and not coming from mere coincidence? Probably. Or maybe just enough evidence to pull out the electrodes or equivalent. -- Mathematics is the supreme nostalgia of our time.