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Steganography programs now extend beyong just gifs, bmps and jpegs. There is a program available to allow files to be hidden within MP3s. They are encoded deep within the mp3 encoding process (optional encrytion and all that obviously) so detecting them can be almost impossible. The added advantage for MP3s is the file size... try hiding anything big in a gif and you're going to need an image as big as a whale. A good place to starting looking into steganography stuff (and a whole range of neat crypto is Ross Anderson's homepage at Cambridge University.
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Steganography programs now extend beyong just gifs, bmps and jpegs. There is a program available to allow files to be hidden within MP3s.
They are encoded deep within the mp3 encoding process (optional encrytion and all that obviously) so detecting them can be almost impossible.
The added advantage for MP3s is the file size... try hiding anything big in a gif and you're going to need an image as big as a whale.
A good place to starting looking into steganography stuff (and a whole range of neat crypto is Ross Anderson's homepage at Cambridge University.