Research On Image Encryption Algorithm Based On Discrete Chaotic Mappin

Discrete chaotic map is often used in image encryption because of its advantages of fast iteration speed and easy implementation,but it also has disadvantages such as single structure and small chaotic area.In this paper,three classical discrete chaotic maps are nested and mixed to construct two new discrete chaotic maps,and combined with the discrete space-time chaotic system,the following several high security image encryption algorithms are proposed.(1)An image encryption algorithm combining coupled map lattice and DNA(Deoxyribonucleic Acid)coding and operation is proposed.In the algorithm,the plaintext image is scrambled according to the chaotic index sequence,the process of diffusion is segmented,and the bitwise Xor and sum modulo operation is set.The algorithm also uses chaotic sequences to determine the rules of DNA encoding and decoding and operation,which can improve the randomness of DNA operation process.Experimental results demonstrate the security of the proposed encryption algorithm.(2)An image encryption algorithm combining multiple coupled map grid and RNA(Ribonucleic Acid)encoding and operation is proposed.The scrambling process of the algorithm adds the process of index sequence selection,adopts the group diffusion algorithm,and adds the process of amino acid determination by chaotic sequence in the RNA coding and operation,which is conducive to improving the complexity of the algorithm.The proposed image encryption algorithm is tested by various security analysis means,and the high security of the algorithm is proved.In this paper,a graphical user interface is built,and an encryption simulation tool containing the above two image encryption algorithms is designed.The tool includes various functional modules of key setting,image encryption and security analysis.