By analyzing several digital chaotic image encryption algorithms, this paper designs a symmetric image encryption scheme based on composite dispersed chaotic dynamics systems. Based on the characteristics of the chaos, the algorithm uses the initial chaotic sequence generated by the Logistic map and the Chebyshev map, and then the chaotic encryption of images is realized by image incising stretch and folding. The existing analysis methods are not in effect yet which are usually used in analyzing these two chaotic maps, and the algorithm can encrypt quickly. The experimental results show the validity and calculating speed of the algorithms.%本文通过对部分数字化混沌图像加密算法的分析研究,设计了一个基于复合离散混沌动力系统的对称图像加密算法.该对称图像加密算法充分利用混沌变化的特性,以Logistic映射和Chebyshev映射生成的混沌序列为初始序列,结合对图像的切割、拉伸、折叠变换,充分打乱图像像素间的相关性,使得针对这两个混沌映射的现有分析方法不再有效,并且可以实现较高的加密速度.实验结果证明了算法的有效性和计算速度.
展开▼
