A MULTILEVEL SECURITY SCHEME USING CHAOS BASED ENCRYPTION AND STEGANOGRAPHY FOR SECURE AUDIO COMMUNICATION

Abstract

Steganography is the practice of encoding secret information in indiscernible way. Audio steganography is the science of hiding some secret text or audio information in a host audio. This paper contains audio stegnography using bit modification of time domain audio samples which is a well known simple technique for multimedia data embedding with potential for large payload But before applying stegnography or hiding secret audio in cover audio a chaos based encryption is performed on secret audio data in order to increase the security against steganalysis. And the bit modification technique is also not the simple LSB (least significant bit) modification technique. It contains two approaches which make the steganalysis more difficult as compare to simple LSB technique. First approach is with selection of bits of sample for embedding secret audio while the other approach is to use the compliment of the secret audio before hiding it in the host message. The improvised proposed approach works against steganalysis and decreases the probability of secret audio being extracted by an intruder. Chaos based encryption is used to secure secret audio in case the stegnography technique breaks.