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Definition: steganography

Hiding a message within an image, audio or video file. Used as an alternate to encryption, it takes advantage of unused bits within the file structure or bits that are mostly undetectable if altered. A steganographic message rides secretly to its destination, unlike encrypted messages, which although undecipherable without the decryption key, can be identified as encrypted. For a white paper on the subject written by Neil F. Johnson of George Mason University, visit www.jjtc.com/Steganography. See ScramDisk, social steganography and cryptography.