From owner-freebsd-multimedia@FreeBSD.ORG Wed Jun 22 04:42:01 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 3E71616A41C for ; Wed, 22 Jun 2005 04:42:00 +0000 (GMT) (envelope-from tim@spyderweb.com.au) Received: from levanto.mail.adnap.net.au (levanto.mail.adnap.net.au [203.6.132.83]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9940C43D53 for ; Wed, 22 Jun 2005 04:42:00 +0000 (GMT) (envelope-from tim@spyderweb.com.au) Received: from bofh.spyderweb.com.au (219-90-238-125.ip.adam.com.au [219.90.238.125]) by levanto.mail.adnap.net.au (Postfix) with ESMTP id C83F95AB0 for ; Wed, 22 Jun 2005 14:11:58 +0930 (CST) Received: from bofh.spyderweb.com.au (localhost [127.0.0.1]) by bofh.spyderweb.com.au (8.13.3/8.13.3) with ESMTP id j5M4gK4C003236 for ; Wed, 22 Jun 2005 14:12:22 +0930 (CST) (envelope-from tim@spyderweb.com.au) Date: Wed, 22 Jun 2005 14:12:20 +0930 From: Tim Aslat To: freebsd-multimedia@freebsd.org Message-ID: <20050622141220.2cabee63@bofh.spyderweb.com.au> Organization: Spyderweb.com.au X-Mailer: Sylpheed-Claws 1.9.11 (GTK+ 2.6.8; i386-portbld-freebsd5.4) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: 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: Wed, 22 Jun 2005 04:42:01 -0000 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 -- Tim Aslat Spyderweb Consulting http://www.spyderweb.com.au Phone: +61 8 84193434 Mobile: +61 0401088479