Chapter 8
Covert Communication Based on the VoIP System
Abstract
The VoIP system is one of the most widely used voice communications systems for the delivery of voice communications and multimedia sessions over the Internet by using the Internet Protocol (IP). G.729 is the speech coding scheme in VoIP. In this chapter, a model for VoIP-based covert communications is put forward based on the analysis of the characteristics of VoIP, and an approach of embedding secret speech information into VoIP G.729 speech flows is proposed based on matrix coding. In the approach, 2.4 kbps MELP speech is used as secret speech, and G.729 coding speech is used as the public carrier. The implementation of embedding and extraction algorithms is presented. ...
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