Novel Speech Secure Communication System Based on Information Hiding and Compressed Sensing

This paper proposes a novel scheme for speech secure communication based on information hiding and Compressed Sensing (CS). The scheme first uses CS technology to compress the secret speech and reduce the information bit rate to be embedded, which is significantly different from state-of-art secret speech processing methods. Secret bit stream is then embedded into cover speech based on SCS (Scalar Costa Scheme) quantization strategy. Two levels of transform: DCT and LWT are employed to enhance the performance of the system. Simulation results show that the scheme has good imperceptibility and is robust against various common channel interferences. The low computational complexity and blind-extraction characteristic of the scheme make it easy to be realized and can effectively guarantee information security in the private speech communication and military secure communication system.