Audio steganography

Drastic increase in the usage of electronic communication needed security of data being transmitted. Steganography is one such technique of hiding the message in a chosen carrier such that no one except the intended receiver is aware of its existence and hence prevents unauthorized access. The goal of Audio steganographic technique is to embed data in audio cover file that must be robust and resistant to malicious attacks. This paper presents various audio steganographic methods like LSB, echo hiding, spread spectrum etc. Merits and demerits of each method are described.