2HIDING INFORMATION
Steganography, from the Greek term for “covered writing,” is the art of concealing a message so that adversaries aren’t aware that the message is present. Unlike cryptography, which relies on the difficulty of undoing the algorithm that generated the encrypted message, steganography relies on secrecy. Anyone can read the covered message if they know how the message is hidden. If the art of hiding a message is called steganography, then steganalysis is the process of detecting hidden messages. It’s a classic arms race: steganographers improve their techniques while steganalysis attempts to thwart them.
While steganography exists ...
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