关键词: 耦合映象格子, 并行性, 分组, 数字图像, 加密

Abstract: In this paper, a novel image blocks encryption algorithm based on Coupled Map Lattice (CML) system was presented to solve the parallel problem of the common image encryption algorithm. The basic idea is to divide the image into blocks，and then used the block number as the spatial parameter of CML to iterate the chaos system. The chaotic stream was used to conduct confusion operations with part of the image，the result of which was applied to encrypt the other part. The proposed method can encrypt image in parallel and can also satisfy color image encryption. The simulation process indicates that the algorithm is easy to realize with low computation complexity，high sensitivity，high speed，high security and other properties simultaneously.

Key words: Coupled Map Lattice (CML), parallelism, blocks, digital image, encryption