From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Meybohm Subject: Re: SHA1 hash safety Date: Wed, 20 Apr 2005 14:56:53 -0400 Message-ID: <20050420185653.GA3076@localhost> References: <20050416123155.GA19908@elte.hu> <4261132A.3090907@khandalf.com> <4261852B.6090507@khandalf.com> <20050418074323.GA29765@hexapodia.org> <20050419223027.GA26100@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andy Isaacson , omb@bluewin.ch, git@vger.kernel.org X-From: git-owner@vger.kernel.org Wed Apr 20 20:53:27 2005 Return-path: Received: from vger.kernel.org ([12.107.209.244]) by ciao.gmane.org with esmtp (Exim 4.43) id 1DOKJc-0001d3-N5 for gcvg-git@gmane.org; Wed, 20 Apr 2005 20:52:49 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261471AbVDTS5B (ORCPT ); Wed, 20 Apr 2005 14:57:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261683AbVDTS5B (ORCPT ); Wed, 20 Apr 2005 14:57:01 -0400 Received: from imf17aec.mail.bellsouth.net ([205.152.59.65]:29570 "EHLO imf17aec.mail.bellsouth.net") by vger.kernel.org with ESMTP id S261471AbVDTS44 (ORCPT ); Wed, 20 Apr 2005 14:56:56 -0400 Received: from localhost ([65.10.203.194]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050420185656.LEUH2434.imf17aec.mail.bellsouth.net@localhost>; Wed, 20 Apr 2005 14:56:56 -0400 To: "C. Scott Ananian" Content-Disposition: inline In-Reply-To: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20030927 Sender: git-owner@vger.kernel.org Precedence: bulk X-Mailing-List: git@vger.kernel.org On Tue, Apr 19, 2005 at 06:48:57PM -0400, C. Scott Ananian wrote: > On Tue, 19 Apr 2005, David Meybohm wrote: > > >But doesn't this require assuming the distribution of MD5 is uniform, > >and don't the papers finding collisions in less show it's not? So, your > >birthday-argument for calculating the probability wouldn't apply, because > >it rests on the assumption MD5 is uniform, and it isn't. > > No, the collision papers don't show this at all. I didn't mean they showed it directly. I meant by finding collisions in MD5 quickly, MD5 would have to have some non-uniformity. But that's nevertheless wrong because uniformness and collision finding ability aren't related. Sorry to have wasted everyone's time. Dave