"Steganography is the art of hiding the existence of a message rather than its meaning. It is currently a very HOT topic as one subdivision of steganography is digital watermarking, a technique used to copyright and to protect digital images, music and software."
Older methods of steganography include writing in lemon juice or tracing words through a piece of paper so that they have to be colored or shaded over to be seen.
Stealthy, right?
SOURCE:
http://home.cogeco.ca/~cipher/
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