基于混沌序列的图像分块加密方法

为了提高图像的加密效果和加密效率,给出一种新的图像置乱加密算法。首先把一幅大的图像分解为适当大小的子块图像,给定适当的初始值和参数,以此作为密码生成混沌序列,再生成该混沌序列的主遍历矩阵,并以此矩阵对块进行置乱;然后再选择另一对初始值和参数生成混沌序列,并以该混沌序列的主遍历矩阵对每图像子块进行置乱加密。该算法的加密效果和加密速度明显优于Arnold、幻方等变换,该算法是一个有效的、实用的图像加密算法。

An Image Blocking Encryption Arithmetic Based on Chaotic Sequences

To improve the effect and the speed of image encryption, a new image encryption algorithm is presented. First,divide the origined image into small blocks with suitable size, and a initial value and a parameter as passwords to generate a chaos sequences, and the blocks are scrambled with the ergodic matrix of the chaos sequences. Then every block is scrambled with a new chaos sequences generated from the other pair of initial value and parameter. The proposed algorithm is better than Arnold or magic square algorithms in effect or speed; it is a very effective and useful image encryption algorithm.