一种基于复合混沌系统的数字图像加密算法 *

利用已有复合离散混沌动力系统在不变分布和迭代轨迹的若干性质 ,以 Logsitic映射产生的离散混沌序列的伪随机性作为基础 ,选择迭代函数产生新的离散混沌序列值 ,设计了图像加密算法。最后讨论了算法的安全性 ,经实验证明此算法使得加密图像具有很高的保密效果。

Digital image encryption algorithm based on composite discrete chaotic system

This paper utilized some characteristics on invariant distribution density and iteration track of a composite discrete chaotic dynamical systemwhich had been presented. Used the R sequence based on the pseudo-randomness of Logistic-map to select iteration function in composite discrete chaotic dynamical systemto get a newchaotic sequence. According to the above, prosented a digital image encryption algorithm. In the end, discussed the security of this algorithm. The result of this experiment shows that the encrypted image has high security.