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Re: [OM] Re: Digital True Lies

Subject: Re: [OM] Re: Digital True Lies
From: "John Cwiklinski" <plinkochips@xxxxxxxxxxx>
Date: Tue, 17 Dec 2002 20:37:20 -0800
Albert wrote:


This is quite possible.  How do you prevent someone from tampering
with it?  You take a hash of the picture, and then you include that
with the picture as supplimental information.  You then sign the
hash with the digital certificate.  The math is such that it's near
impossible to fake, but easy to verify.

You can also do this for future formats, and be guaranteed that you
would know if your picture got ripped off...  You can prove in a
court that YOUR CAMERA took that picture...
<<

No, No! The problem is that upon examination you "could" find multiple certificates (watermarks) residing on the digi photo or file or mp3. Therefore, who's certificate is the authentic one? I don't think Canon has solved this problem. Very difficult.

John Cwiklinski

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