An Algorithm And Implementation Of H.265 Video Encryption Based On Time-varying Symbolic Dynamical Systems

With the rapid development of information technology and computer technology,high-quality digital video applications gradually come into more people's daily lives,people have higher and higher demand for performance of video compression.In April 2010,a new generation of video compression standard(H.265)was developed by the Video Coding Group(JCT-VC),which was re-established by VCEG and MPEG.However,H.265 standard does not consider how to prevent video data from being stolen,destroyed and tampered,so it is important to study a video encryption algorithm suitable for this new H.265 standard.The part of this research was supported by JCYJ“Research on key technologies of optical communication based on optical encoding physical layer security(20160328145357990)”.This research focus on the H.265 standard encryption algorithm.Combining the characteristics of chaotic sequence code and H.265 compression standard,we design a new video encryption scheme.In this scheme,we use the time-varying symbolic dynamical system for generating a chaotic sequence with good pseudo-random performance.Then we improve the original arithmetic coding scheme and design a video encryption scheme suitable for H.265 characteristic by using chaotic pseudo-random sequence and improved arithmetic coding.Finally,we prove that the video encryption algorithm has a good effect through theoretical analysis and simulation experiment.The innovation of this paper is as follows:1)In this paper,we strictly prove the Chaos of a time-varying generalized symbol dynamical system in theory.Combining with the sequence of registers and chaotic sequences,a new generation a new generation method of pseudo-random sequence is proposed.And we detect the performance of the sequence by the common pseudo-randomness detection method,such as single bit frequency detection,poker detection and autocorrelation detection.Finally,the simulation results show that the random performance of the sequence is excellent.This work lay the foundation for the design of keystream sequences in chaotic sequence ciphers.2)Using the new time-varying symbolic chaotic system,we design a new chaotic sequence encryption algorithm,and apply it to digital image encryption.We find that it has a good encryption effect through making simulation experiment.The results show that the encryption algorithm has the advantages of high key space,strong key sensitivity and good anti-statistical attack.3)Based on the characteristics of the original arithmetic coding in the new standard H.265,we propose an improved scheme of arithmetic coding and design a new video encryption scheme with the new time-varying symbol chaotic system.Then we analyze the rationality of the program through the theory.Finally,we use HM15.0 simulation platform to verify the program has a good encryption effect,and find some advantages of the video encryption algorithm,such as high compression efficiency,compression ratio and video data format unchanged,etc.