StegoWav hides a message in a given RIFF (8/16 bits) PCM .wav file. If the message is shorter than required to cover the full image, random noise will be added. It is better to compress the message with a lossless compressor such as .zip (or pkzip), so that it will appear more "random" and will not generate patterns on the coded image.

Investigator's Guide to Steganography
Investigators Guide to Steganography
ISBN: 0849324335
EAN: 2147483647
Year: 2003
Pages: 220

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