Research On Image Encryption Algorithm Based On Chaotic System And Cross-plane Scrambling Diffusion

Digital image is an intuitive and efficient transmission medium.It has the characteristics of large amount of data,data redundancy and high data correlation.It is often used as a tool for transmitting information.Traditional encryption methods are not suitable for digital images.Therefore,designing a digital image encryption algorithm has become a key issue.After more than 50 years of in-depth research on chaotic systems,the theoretical basis has gradually matured.It is widely used in encryption technology because of its inherent randomness,unpredictability and high sensitivity to initial value.Therefore,based on the classical scrambling-diffusion cryptosystem and the existing research,this paper proposes two image encryption algorithms,and conducts experimental tests and security analysis on the Matlab2017 a simulation platform.(1)A cross-plane image encryption algorithm based on dynamic two-dimensional Henon cosine mapping is proposed.The algorithm solves the problems of small chaotic interval of two-dimensional Henon chaotic map and no relevance of each channel in the encryption process.By combining the cosine formula and introducing dynamic control parameters,the chaotic interval is expanded and the selection range of key value is expanded.Recombine the channels of the image,use the extended Zigzag scrambling method to confuse the pixels of each channel,and disrupt the arrangement of pixels between the channels.Then the chaotic sequence generated by the 2D HCLM chaotic map is used for secondary sorting scrambling and two rounds of non-sequence diffusion to obtain the ciphertext image.(2)An image encryption algorithm based on dynamic feedback Cubic chaotic system is proposed.The algorithm solves the problems of uneven output of chaotic system,weak correlation between key and plaintext and computational efficiency.The results of the coupling of the two chaotic maps are fed back to the original chaotic map,and the output values are normalized to make the chaotic trajectory of the newly generated chaotic system more complex and the output values more uniform.The message digest generated by SHA3-256 is combined with random sequence to strengthen the connection between key and plaintext and the randomness of key stream.Parallel scrambling and cross-plane diffusion improve the efficiency of the algorithm while ensuring the security of the algorithm.The images used for encryption in this article are from the USC-SIPI dataset.Through simulation experiments and security analysis,the results show that the proposed algorithm is closer to the ideal value in information entropy,adjacent pixel correlation,pixel change rate,uniform average change intensity and other evaluation indicators,and passes the random number test.It shows that the algorithm can effectively resist differential attack,exhaustive attack,chosen plaintext attack and other attack means,and has sufficient security.Figure 38 Table 21 Reference 83...