Adaptive VoIP Steganography for Information Hiding within Network Audio Streams

With the rapid development of the Internet, steganography on Voice over IP (VoIP) has been attracted a lot of research efforts. To date, existing VoIP steganography research commonly focus on information hiding in the LSB bits of Network Audio Streams, yet, we found this approach may raise serious security threat, where the hidden information may be easily removed, detected and attacked. Towards this issue, in this paper, we propose AVIS, a novel Adaptive VoIP steganography approach to hide information within Network Audio Streams. AVIS consists of two parts, named VAMI and VADDI. VAMI works by dynamically select multiple bits based on the VoIP vector value, while VADDI dynamically changes embedding intervals to avoid detection and attacking. We also implemented AVIS and conducted extensive experiments in real systems. Experimental results demonstrate the effectiveness of our proposed AVIS scheme.