Date: Tue, 21 Jun 2005 22:21:41 -0700 From: Jacob Meuser <jakemsr@jakemsr.com> To: freebsd-multimedia@freebsd.org Subject: Re: tamper proofing audio Message-ID: <20050622052141.GC23165@puff.jakemsr.gom> In-Reply-To: <20050622051314.GB23165@puff.jakemsr.gom> References: <20050622141220.2cabee63@bofh.spyderweb.com.au> <20050622051314.GB23165@puff.jakemsr.gom>
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On Tue, Jun 21, 2005 at 10:13:14PM -0700, Jacob Meuser wrote: > On Wed, Jun 22, 2005 at 02:12:20PM +0930, 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. > > Simply verifying the files with checksums (multiple algorithms to > lessen the possibility of "collision attacks") is insufficient? also, bsdav -> http://www.jakemsr.com/bsdav/ (which can be used for audio only) records the system time for every data "frame". may be useful as well. -- <jakemsr@jakemsr.com>
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