Literature Review on Audio Steganography

Abstract

Audio steganography is concerned with embedding information in an innocuous cover speech in a secure and robust manner. Communication and transmission security and robustness are essential for transmitting vital information to intended sources while denying access to unauthorized persons. Encoding secret messages in audio is the most challenging technique to use when dealing with steganography. This is the most challenging because of the human ability to distinguish small variations in sounds. The range of the human auditory power is dynamic. Humans can distinguish small changes in the audio with crystal clarity. Audio steganography is a useful means for transmitting covert military information via a cover audio signal which is virtually untraceable. The two primary criteria for successful embedding of a covert message are that the stego signal resulting from embedding is perceptually indistinguishable from the host audio signal, and the embedded message is recovered correctly at the receiver. In this paper we provide a review on various audio steganography techniques.