基于广义2D-Arnold映射和超混沌的图像加密新算法

针对图像加密算法容易被破解、效率低等问题，提出了一种基于广义2D-Arnold映射和超混沌的图像加密算法。首先利用广义2D-Arnold映射对修正后的数字图像的像素位置进行几何变换；然后利用超混沌系统迭代产生两个密钥序列。图像的扩散过程包括两轮基于双重密钥的图像扩散。实验结果表明该算法能够抵抗选择明文攻击和已知文攻击。安全性分析表明，该算法安全性好，效率高，具有良好的统计特性及差分特性。

New Image Encryption Algorithm Based on 2D-Arnold Mapping and Hyper-chaos

In view of image encryption algorithm is easy to be decrypted and has low encryption efficiency,a new im-age encryption algorithm based on generalized 2D-Arnold map and hyper-chaos is proposed. At first, the generalized 2D-Arnold map is used to change pixel location of the modified image. Secondly, a hyperchaos system are employed to produce two chaotic key streams. Two rounds of image encryption based on double keys are included in the stage of diffusion. Experiment results show that the image encryption method can resist chosen plaintext and known-plaintext at-tack. Security analysis show that algorithm have a secure, high efficiency, good statistical characteristics and differential characteristics.