It's called steganographics. Contrababd9h by JTHZ Productions is an example
of this using BMP files.
> -----Original Message-----
> From: Phillips, Steven W (Steve), GOVMK [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, May 26, 1999 5:20 PM
> To: [EMAIL PROTECTED]
> Subject: Hide and Seek Programs
>
> Does anyone have information on programs that can be used to hide files in
> GIF images? I have never seen this done, but have been told that they are
> call Hide and Seek programs. If anyone knows how this is done and whether
> or not the presence of a file in a GIF image can be detected using some
> sort
> of file scanner, please let me know.
>
> TIA,
>
> Steven Phillips
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