tamper proofing audio

[Jacob Meuser]

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?

-- 
<jakemsr at jakemsr.com>

> 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 <tim at spyderweb.com.au>
> Spyderweb Consulting
> http://www.spyderweb.com.au
> Phone: +61 8 84193434
> Mobile: +61 0401088479
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