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Subject:Re: Hidden digital signature in a graphic From:Sandy Harris <sandy -at- storm -dot- ca> To:"TECHWR-L" <techwr-l -at- lists -dot- raycomm -dot- com> Date:Mon, 26 Nov 2001 12:08:23 -0500
John Posada wrote:
>
> Hi, guys...
>
> I have about 300+ images, ...
>
> I don't want the copyright message to be visible with the naked eye,
> ...
>
> The program that does this would have the following qualities:
>
> - Be cheap ($49 or less)
> - Be fast or run in batch mode unattended
> - Be transparent to people viewing the photos
> - Function on images distributed by CD, not the web (therefore,
> something like Digimarc is not an option),even though the message
> contained in images that are transfered from the CD to the web can
> viewed.
> - Not interfere with being able to view in any program they want.
All of that is technically easy.
The hard part comes if you want it to be secure. You can define secure
either as not being detectable or not removable by a user who knows it
is there. Either way, a good solution is PhD thesis material.
My web search for "steganography", the technical term for this trick,
turned up many resources. A couple of the more promising ones are:
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