Cryptography sign the image sans the least significant bits, then add the signature in said position: http://www.lia.deis.unibo.it/Courses/RetiDiCalcolatori/Pr

Cryptography sign the image sans the least significant bits, then add the signature in said position: http://www.lia.deis.unibo.it/Courses/RetiDiCalcolatori/Progetti98/Fortini/lsb.html http://www.lia.deis.unibo.it/Courses/RetiDiCalcolatori/Proge... Shouldn't be too noticeable. A similar approach should work for audio too.