From owner-freebsd-multimedia@FreeBSD.ORG Mon Jun 27 22:54:14 2005 Return-Path: X-Original-To: freebsd-multimedia@freebsd.org Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2F23916A424 for ; Mon, 27 Jun 2005 22:54:14 +0000 (GMT) (envelope-from jason@ec.rr.com) Received: from ms-smtp-04-eri0.southeast.rr.com (ms-smtp-04-lbl.southeast.rr.com [24.25.9.103]) by mx1.FreeBSD.org (Postfix) with ESMTP id D014843D58 for ; Mon, 27 Jun 2005 22:54:13 +0000 (GMT) (envelope-from jason@ec.rr.com) Received: from [192.168.1.101] (rrcs-24-172-31-78.midsouth.biz.rr.com [24.172.31.78]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with ESMTP id j5RMsAL4020604; Mon, 27 Jun 2005 18:54:10 -0400 (EDT) Message-ID: <42C083ED.9080609@ec.rr.com> Date: Mon, 27 Jun 2005 18:55:41 -0400 From: jason henson User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050426) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Tim Aslat References: <20050622141220.2cabee63@bofh.spyderweb.com.au> In-Reply-To: <20050622141220.2cabee63@bofh.spyderweb.com.au> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Symantec AntiVirus Scan Engine Cc: freebsd-multimedia@freebsd.org Subject: Re: tamper proofing audio X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Jun 2005 22:54:14 -0000 Tim Aslat wrote: > Hi All, > > can anyone tell me if it's possible to tamper-proof an audio recording > in such a way that it can still be played on a normal audio CD player? > > I'm not worried about the recording being copied, but I am worried > about it being modified and want to guard against it. Its for a voice > recorder project in a lawyers office where they want to be able to > prove conclusively that a certain audio recording was made on a > specific machine and hasn't been tampered with. I understand that it > is impossible to make anything completely tamper-proof, but I would > like to make it at least difficult for someone to do without some very > substantial resources and skills available to them. > > The recording unit is a standalone PC running FreeBSD 5.4-RELEASE, and > it would be nice not to have to change that. > > Please contact me off-list with details. > > Cheers > > Tim > > Put a unique id string or the like in the center of the disc when it is pressed or made that burners can not write to. You will have conclusive prove if the disc in question is a fake or authentic, unless the other guy has a cd press too.