基于超混沌系统的自适应图像加密算法

基于超混沌系统提出一种自适应图像加密算法。先对超混沌信号进行改造处理，并根据明文像素信息对序列进行变换，使得密钥序列对明文图像敏感；然后以前一个加密像素为基础，通过非线性运算产生中间密钥自适应加密后一个像素，直至所有像素加密完成；最后分别从统计特性、抗差分攻击、密钥敏感及密钥空间和执行效率对算法进行仿真分析，结果显示该算法具有安全性高、运行效率高等特点。

Self-adaptive Image Encryption Algorithm Based on Hyper-chaotic System

This paper presents a self-adaptive image encryption algorithm based on hyper-chaotic system.Firstly, the hyper-cha-otic sequences which are pretreated are transformed according to the plaintext pixel information that result in both key sensitivity and plaintext sensitivity;then, the last encrypted pixel is used to produce intermediate key through nonlinear operation to encrypt the next pixel adaptively , until all pixels are encrypted completely;finally, the simulation analyses are performed using statistical property , anti-differential attacks , key sensitivity and key space and algorithm efficiency .Experimental results show that the algo-rithm is secure and efficient .