From owner-freebsd-security@FreeBSD.ORG Wed Aug 18 23:46:57 2004 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EB44E16A4CE for ; Wed, 18 Aug 2004 23:46:57 +0000 (GMT) Received: from lariat.org (lariat.org [63.229.157.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5966643D41 for ; Wed, 18 Aug 2004 23:46:57 +0000 (GMT) (envelope-from brett@lariat.org) Received: from runaround.lariat.org (IDENT:ppp1000.lariat.org@lariat.org [63.229.157.2]) by lariat.org (8.9.3/8.9.3) with ESMTP id RAA05055; Wed, 18 Aug 2004 17:46:50 -0600 (MDT) X-message-flag: Warning! Use of Microsoft Outlook renders your system susceptible to Internet worms. Message-Id: <6.1.1.1.2.20040818174540.08540a60@localhost> X-Sender: brett@localhost (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 6.1.1.1 Date: Wed, 18 Aug 2004 17:46:48 -0600 To: chris-freebsd@randomcamel.net, freebsd-security@freebsd.org From: Brett Glass In-Reply-To: <20040818205440.GL9800@zot.electricrain.com> References: <200408181724.i7IHORYl013375@bunrab.catwhisker.org> <20040818175804.GI346@cowbert.net> <41239B0C.1000703@rdslink.ro> <20040818182957.GK346@cowbert.net> <20040818205440.GL9800@zot.electricrain.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Subject: Re: Report of collision-generation with MD5 X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Security issues [members-only posting] List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Aug 2004 23:46:58 -0000 At 02:54 PM 8/18/2004, Chris Doherty wrote: >what you can do, if you have a proper attack formula, is find *a* message >that produces *that one hash*. that is, if I have message M which produces >hash H, I can use the attack to find *a* message M' which will also >produce hash H. The thing is, passwords are short and have limited entropy. Chances are, if you find a password that produces the same hash, it's M. --Brett