利用耦合映象格子的时空混沌特性,研究提出了一种混沌图像加密算法.首先由耦合映象格子产生随机数序列,将平文图像划分为8幅位级图像并进行位级图像置乱;然后选择对应的随机数序列组合,采用逐位异或运算进行图像像素扩散;测试结果表明所提算法比其它算法具有更好的加密性能和有效性.
A chaotic image encryption algorithm is presented with the spatiotemporal chaotic properties of coupled map lattices. With the random number sequences generated from coupled map lattices, 8 bit-level images divided from the plain image are permuted as a group. Then the image pixel-level diffusion is carried on bitwise XOR operation with selecting a corresponding combination of random number sequences. Simulation results show that the performance and security of the proposed algorithm is better than those of other existing algorithms.