复合混沌迭代系统保持了所有迭代子系统的混沌特性，比单个子系统的动力学行为复杂得多，其生成的密钥串按二进制位独立同分布。为了更好地进行图像加密，提出了一种基于复合混沌的自适应图像加密算法。该算法是利用密钥串的值，结合图像像素值确定的置乱顺序对图像进行加密。实验表明，用该算法可以达到很好的自适应加密效果。当总密钥长度大于128bits时，该系统是很难破解的。

Composite discrete chaotic iterative system keeps all characteristics of each single chaotic iterative system and its dynamic behavior is more complicated. Because the key generated from composite discrete chaotic iterative system is independent identically distributed, encrypting the image by using the key and adaptive image scrambling algorithm can get a satisfied result. When the length of the entire key is more than 128 bits, the encryption system is robust under attack.