An enhanced least significant bit modification technique for audio steganography

Increased use of electronic communication has given birth to new ways of transmitting information securely. Audio steganography is the science of hiding some secret text or audio information in a host message. The host message before steganography and stego message after steganography have the same characteristics. Least Significant Bit (LSB) modification technique is the most simple and efficient technique used for audio steganography. The conventional LSB modification technique is vulnerable to steganalysis. This paper proposes two ways to improve the conventional LSB modification technique. The first way is to randomize bit number of host message used for embedding secret message while the second way is to randomize sample number containing next secret message bit. The improvised proposed technique works against steganalysis and decreases the probability of secret message being extracted by an intruder. Advanced Encryption Standard (AES) with 256 bits key length is used to secure secret message in case the steganography technique breaks. Proposed technique has been tested successfully on a. wav file at a sampling frequency of 8000 samples/second with each sample containing 8 bits.