Design And Implementation Of Hevc Video Encryption Scheme Based On Two-dimensional Chaotic System

With the development of Internet technology,video and other multimedia technologies have been widely used.Digital video information provides convenience for people,but at the same time,it also has some security risks.Because video digital information is vulnerable to malicious attacks by illegal elements in the process of storage and transmission,how to protect the security of video information is of great significance.Among them,encryption technology is an effective way to protect video information security.At present,the urgent need for highdefinition video promotes the development of video coding standard HEVC.The existing HEVC video encryption algorithms are rarely studied,and there are some shortcomings,such as format incompatibility after video encryption,impact on bit rate and compression performance,etc.Therefore,the research of video encryption scheme based on HEVC is of great significance.This paper focuses on the video encryption technology based on the entropy coding characteristics of HEVC.Based on the research of various pseudo-random performances of a class of symbolic chaotic systems,considering the requirements of video encryption format,code rate and compression performance,combined with the characteristics of transform coefficient entropy coding and video motion information,this paper proposes A HEVC video joint encryption scheme based on two-dimensional time-varying symbol chaotic system.Simulation experiments show that this joint encryption scheme has good encryption effect and security.The innovations studied in this paper mainly include the following aspects:1)Theoretically,the chaos of a class of two-dimensional time-varying generalized symbolic dynamic systems is proved.Combining with the system and nonlinear shift register,a method for generating chaotic random sequences is proposed,and the generated chaotic sequences are performed.Detection of many common random properties.Simulation experiments show that the generated sequences have good random performance.2)A new chaotic digital image encryption algorithm is proposed.Experiments and multiple performance analysis show that the algorithm has good image encryption effect.Then compared with the Logistic chaotic image encryption algorithm,it shows that the algorithm has larger key space,stronger anti-statistical attack capability and higher security.3)According to the entropy coding characteristics of HEVC,in order to ensure the compatibility of encrypted video formats,keep the bit rate and compression performance unchanged,and fully consider the important role of transform coefficients and motion vector differential entropy coding for video reconstruction,a joint encryption scheme of chaotic video is proposed in this paper.The simulation results show that the encryption scheme guarantees the compatibility of video format,has no effect on bit rate and compression performance,and has a good encryption effect and security with less computational cost.