Chapter 2

The Information Hiding Model for Speech Secure Communication

Abstract

This chapter presents a speech information hiding model for transmitting secret speech through subliminal channels covertly for secure communication over PSTN or VoIP. The proposed model for secure communication based on the technique of information hiding has more severe requirements on the performances of data embedding than watermarking and fingerprinting in the aspects of real time, hiding capacity, and speech quality. The main statement of the model is that the embedding operation of a secure communication system holds a lot of uncertainty for the attackers. The security analysis of this model by means of information theory and actual tests proved that ...

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