Research On Cross Coupled Map Lattices Model And Its Application In Video Encryption

With smartphones’ popularity and network bandwidth increasing in recent years,video data has gradually become an important way for people to obtain information,entertainment,and leisure.The popularity of short video applications has also made video data a "third language" in the mobile Internet,expressing producers’ daily life and behavior.The proportion of personal privacy and copyright information in video data has increased significantly,which poses a challenge to video data protection technology.At the same time,the development trend of high-definition and real-time video distribution also makes traditional encryption technologies ineffective for video data protection.With strong key sensitivity and fast encryption speed,chaotic ciphers provide new ideas for developing video data protection technology.In this paper,we study the parameter characteristics and dynamical behavior of the Cross Coupled Map Lattices model based on tent map introduce the framework of the ZUC encryption algorithm,realize the parallel discretization process of the model,and design a selective video encryption algorithm based on the Cross Coupled Map Lattices model.The main research work is as follows:(1)Briefly describes the basic theoretical knowledge of chaotic systems and video coding techniques,introduces in detail the dynamical behavior of the classical and spatiotemporal chaotic systems,outlines the basic structure of video coding techniques,and analyzes the coding process of H.264 video coding protocol.(2)Study the Cross Coupled Map Lattices model based on tent map,and analyze the model dynamics and parameter characteristics.Explain the specific influence of the "return diffusion" behavior on the spatiotemporal characteristics of the model,and prove the system-generated sequences’ open-flow characteristics and high-dimensional complexity.At the same time,test the invariant distribution characteristics,approximate entropy,and correlation characteristics of the system-generated chaotic sequences,and determine the reliable parameter range for the system cryptography design.(3)Design a parallel pseudo-random sequence generation algorithm based on the Cross Coupled Map Lattices model by introducing the ZUC stream cipher algorithm framework.The pseudo-random sequences are linearly perturbed using the ZUC algorithm linear feedback shift register and bit recombination module.The Cross Coupled Map Lattices generate chaotic sequences with bit recombination sequences nonlinearly parallel coupled to generate pseudo-random sequences with chaotic characteristics.The experimental analysis results show that the generated parallel sequences are independent of each other,with high randomness and antiattack capability,and can be used to design video encryption algorithms.(4)A multi-link selective video encryption algorithm based on the Cross Coupled Map Lattices model is designed for the H.264 video coding protocol.Based on the analysis of the coding structure characteristics of the H.264 video coding protocol,the key syntax elements of intra-frame prediction,inter-frame prediction,entropy coding,and other links are selected as encryption objects for encryption.The experimental results show that the encryption scheme has an excellent visual encryption effect,strong anti-attack capability,and low encryption time consumption.The video format remains unchanged,which can be applied to real-time video encryption occasions like video conferencing.