将改进的超混沌Lü系统及广义Henon混沌映射结合起来,引入到数字图像加密算法中,采取置乱与扩散同步进行的方式,依次将每一个像素点完成位置变换、像素值变换的加密过程.加密算法既弥补了低维混沌系统的缺陷,又增加了加密的复杂度,同时还扩大了密钥空间的精度.通过仿真实验,证明加密算法的各项指标系数非常接近于理论最佳值,表明加密算法具有良好的安全性,加密效果良好,可以有效地抵御各类攻击,具有良好的应用前景.%The improved hyperchaotic L ü system and generalized Henon chaotic mapping were combined into the digital image encryp -tion algorithm, and the method of scrambling and diffusion was carried out in the synchronized way , and each pixel was completed in turn to complete the position transformation and the encryption process of pixel value transformation .The encryption algorithm compen-sates for the defects of the low dimensional chaotic system , increases the complexity of encryption , and enlarges the precision of the key space .Through simulation experiment , it is proved that the encryption algorithm is very close to theoretical optimum value coefficient of each index , showing that the encryption algorithm has good security and encryption effect .It can effectively resist various attacks , pos-sessing a good application prospect .
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