A Lossless Steganography Technique for G.711 Telephony Speech

Steganography may be employed for secretly transmitting side information in order to improve the performance of signal processing such as packet loss concealment and band extension of telephony speech. The previous studies employ LSB replacement technique for embedding steganogram information into speech data. Instead of such a lossy steganography technique, this study proposes a lossless steganography technique for G.711, the most common codec for the telephony speech based on VoIP. The proposed technique in this study exploits the characteristic of G.711 for embedding steganogram information into speech data without degradation. This paper also proposes a semi-lossless steganography technique for increasing the capacity of the proposed technique.