Abstract: Aiming at infrared image security protection in early warning detection system, an image encryption and  steganography method based on high performance hyperchaotic system is proposed. Firstly, a high performance 2D hyperchaotic system is constructed by combination sine function with close-loop modulation technique. Secondly, the weak structure random sequence is generated by the proposed hyperchaotic system with larger lyapunov index, and it is applied to control the pixel diffusion operation with feedback structure to realize image encryption,which is combined exclusive-or operation, include-or operation, with adding operations in finite field. In the end, the pixel location information is embedded into the pixel value of cipher image, and cipher image is camouflaged as texture image with some significance. Experimental results show that the proposed image encryption method has high security, and the steganography method of cipher image is simple and effective.

Key words: image encryption, hyperchaotic map, sine function, include-or operation, exclusive-or operation, image steganography

摘要： 针对预警探测红外图像安全保护的需要，提出一种基于高性能超混沌系统的图像加密与伪装方法。该方法首先利用正弦函数和闭环调制技术构造一种高性能的二维正弦超混沌系统；其次将其产生的弱结构随机序列控制反馈式异或运算与同或运算相混合的像素扩散操作实现图像加密；最后将密文图像嵌入像素位置信息并伪装成有意义的纹理图像。实验测试结果表明：所建议的图像加密方法具有较高的安全性；同时，密文伪装方法简单有效。

关键词: 图像加密, 超混沌映射, 正弦函数, 同或运算, 异或运算, 图像伪装