Abstract: In this era of emerging communication technologies, secure transmission of secret & sensitive information has always been a challenge due to various attacks on it. Audio Steganography is considered one of the reliable techniques to hide a secret message with in an audio. LSB technique is very efficient technique to embed secret message by replacing LSBs of carrier audio. In this paper Dual Key Indexing method is proposed to map secret message onto the LSBs of the carrier audio. Primary key is provided by Trusted-Third-Party (TTP) whereas secondary key is provided by the encoder which will be needed to extract the secret message at receiver end. The proposed method injects more randomness & confidentiality as compare to the traditional methods.

Keywords: Audio Steganography, Dual key indexing, Data Embedding, LSB method, Trusted Third Party.