As a carrier medium for concealed messages abc is pretty poor. The tunes are too small, and contain too little redundant information. This means that you have to add some (apparently) redundant characters to contain the message, and it's a dead giveaway. Steganography is usually done by substituting the low-order bits for each pixel of a picture, or each sample in a sound file. The message is itself encrypted, and if you use a modern encryption algorithm, the resulting cyphertext is indistinguishable from a string of random numbers. The only effect on the carrier picture or sound is to make it a little more noisy. Unless the enemy has a copy of the original picture/sound to compare, there is no way he can prove that the intercepted message contains anything unusual.
abc is simply too good at doing what it was designed for to be used for anything else. Phil Taylor (Who has been writing a shareware encryption program, but doesn't feel like releasing it right now.) To subscribe/unsubscribe, point your browser to: http://www.tullochgorm.com/lists.html
