基于耦合超混沌Hénon映射的图像加密算法

摘要

针对混沌图像加密算法中实现混沌信号混沌退化和明文相关度差两个缺陷，提出一种新的图像分组加密算法。算法将Logistic混沌信号和前一明文子块组成干扰项，对超混沌Hénon映射的迭代过程进行控制，从而将Logic混沌信息和明文信息与超混沌Hénon映射充分耦合。不仅有效增强了混沌映射的复杂性，克服了混沌序列退化，而且使算法安全强度依赖明文。仿真实验表明，算法具有加密速度快、密钥空间大和敏感性高等优点。%In this paper , a new image group encryption algorithm is presented to resolve the problems of chaos degradation of chaotic signal and poor relevance to plaintext that exist in image encryption algorithms based on chaos .The algorithm forms an interference item consisting of Logic chaotic signal and sub-block of previous plaintext to control the iterative process of hyperchaotic H énon mapping so as to sufficiently couple the Logistics chaotic information and plaintext information with the hyperchaotic H énon mapping.This enhances the complexity of chaotic mapping effectively and overcomes the degradation of chaotic sequence , and also let the security strength of the algorithm to rely on the plaintext.Simulation experiment indicates that algorithm has the advantages of quick encryption , enough large key space and high sensitivity .