Research On Digital Audio Security Coding Based On AVS-P3

With the development of mobile network and internet, speech communication has penetrated into people’s lives in many fields. The thing is that the privacy of speech data may be revealed because of the openness of mobile network and internet. How to strengthen the security of voice and data has become an important problem. Recently, some researchers and institutions have been working hard on this field, and have got some achievement. On the one hand, Audio Video Standard part-3, the audio coding has very broad application prospects with its high efficiency and scalability. On the other hand, the characteristics in Cellular Automata that sensitivity to the initial value, the complex dynamic characteristics, suitable for VLSI implementation and highly parallel, make it be widely concerned in the field of cryptography. With this background, this paper uses the pseudo-random sequence to encrypt the CBC entropy coding in AVS-P3standard generated by the hybrid cellular automata. The main results include as follows,First, the AVS-P3Audio standard is being analyzed, and the FGS and high-efficiency coding efficiency are well grasped. CBC is an efficient quantization entropy coding method adopted in the AVS-P3Audio standard, it can also be used in multimedia coding includes the step of entropy coding, its research helps to promote the advancement of multimedia encryption techniques.Secondly, theoretical research on MHT encryption algorithm provides a theoretical guidance for this paper. On the comparative analysis of the chaotic sequence and CA pseudo-random sequence, this paper pointed out that it has adopted combining of chaotic sequence and hybrid cellular automata pseudo-random sequence to provide security guarantees.Thirdly, a novel digital audio encryption scheme based on CBC is proposed. During the CBC encoding, scalable cryptographic operations including mode information for each code bands, scale factors and spectral data are encrypted, respectively. The experimental results show that this scheme is more secure than the MHT encryption algorithm, and has low computational complexity, meet the needs of practical application under the premise of ensuring the coding efficiency.Fourthly, we have designed an AVS-P3audio security coding communication software based on MFC and Winsock programming techniques using the open source code. In order to meet the security requirements of different occasions, the software provides different security levels to choose.Finally, the dissertation is concluded. Some problems as well as further work are also given.