A Block Image Encryption Algorithm Based on 2D Chaotic System

Aiming at the problem that some encryption algorithms based on 1D chaotic systems cannot ensure sufficient security when encrypting color images and grayscale images, this paper proposed a block image encryption algorithm based on 2D chaotic systems. The algorithm has four modules. The first module is to transpose the image into a 1D array and then perform block encryption. The second module is to use 2D Logistic chaotic system to generate pseudo-random sequence, 2D Standard chaotic system to generate S-boxes and P-boxes. The third module uses the CFB mode in the block cipher and perform two-way encryption. The fourth module uses the key and ciphertext to determine the number of bits to shift. Therefore, the algorithm has good performance and has certain application prospectst.