[WM]: Re: Another use for steganography

[Jon Roland <jdr@pynthan.com>]

Yes, and that's what I've been doing. However, if the falsifier wants to use a recording of my voice made with a music overlay he
has only to identify the piece and subtract it from the track before beginning his work. I've been using obscure electronic pieces
that would be difficult to identify.

I am looking for something more subtle that he would have trouble detecting or subtracting, such that even if he used samples of my
voice to fabricate a track, something of the watermark would survive and be detectable by a computer program that would produce a
report that would be convincing to a court, more so than a perhaps subjective opinion that the background music shows signs of
editing.

David Weekly wrote:
> Jon,
> 
> Sorry for taking a month to get back to you on this. I guess you 
> slipped through my email cracks. :)
> 
> You've brought up an interesting application of watermarking that I 
> had not considered; detecting the continuity of a recording. This 
> could be fairly tricky to intersperse with the recording in a subtle 
> way if perceptual coding is used, but background music seems a very 
> clever mechanism - wouldn't it be sufficient to play a piece that had 
> no looping parts or repeated sections? That would seem to get you 99% 
> of the way to where you wanted to go.
> 
> -D
> 
> 
> On 12/16/05, Jon Roland <jon.roland@constitution.org> wrote:
> 
>>I am seeking an application for steganography: Production of a 
>>soundtrack, probably in the form of a music CD, that could be played 
>>in the background during a taped interview with a subject, that could 
>>be used to reveal if the taped words of the subject are used to 
>>compose a false "recording" to be used against him. The idea would be 
>>to be able to run the altered "recording" through a computer analysis 
>>program that would reveal in a way convincing to laypersons (such as 
>>members of a jury) that the recording presented as "evidence" is in 
>>fact falsified, by editing or sampling the original recorded words of 
>>the subject. It should be able to show gaps, interpolations, changes of order or inflection, and other changes that would be
introduced in such a fabrication.
>>
>>The CD should be easy to use, such as by playing it in continuous loop 
>>mode on an ordinary portable CD player at a low volume.
>>
>>Are you aware of anyone who has done anything like this, or who might 
>>make available such a CD, and software to analyze it, for a reasonable 
>>fee? Preferred platform for the software is Linux.

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