基于交叉混沌映射的小波域图像加密算法*

随着网络安全的地位不断增强,图像加密也日益引起人们的关注。本文针对这一现象设计了一种新的图像加密算法。该算法先将图像进行小波变换,再利用交叉混沌映射产生的混沌序列分别对低频和高频系数进行分块置乱；小波逆变换后,再用一组新的混沌序列对置乱后的图像进行扩散。实验证明,该算法密钥空间大,密钥敏感性强,能有效地抵抗暴力攻击、统计攻击和差分攻击。

Algorithm of Image Encryption in Wavelet Domain Based on Cross Chaotic Map

With a increasing significance of network security, image encryption has already become a cause for concern. To find out a better solution, this paper designed a new algorithm of image encryption. In this new algorithm, the image is encrypted by block shuffling the wavelet coefficients using chaotic sequences generated from cross chaotic map. A shuffled image can be achieved after inverse wavelet transforming, and it will be diffused by a new chaotic sequence. The experimental results have proved that key space of our algorithm is big enough, and the keys are sensitive. Our algorithm can resist brute-force attacks, statistical attacks and differential attacks efficiently.