A chaotic image encryption algorithm based on random dynamic mixing

This paper proposes a new chaotic system, combined with the dynamic mixing of pixel values, pixel bits, and binary bits encryption algorithms, which are used together in image encryption. The whole process is as follows. First, the original plain text image is converted into an initial key through the SHA-512 algorithm and related operations, then the initial key is applied to the proposed delayed feedback dynamic mixed linear-nonlinear coupled mapping lattices (DFDMLNCML) to obtain the chaotic matrix required for encryption, next, perform the encryption operation of mixed pixel values, pixel bits and binary bits, scrambling and diffusion are done together to improve the security of the algorithm. Finally, the average NPCR, average UACI is 99.6075, 33.4795, respectively, experimental results and various security analyses show that the performance of the system and algorithm is good, and it can resist ordinary attacks, such as selecting plaintext attacks, cropping attacks, and noise attacks.