基于级联混沌的灰度图像加密算法

Gray Image Encryption Algorithm Based on Cascade Chaostic

为提高数字图像在传输中的安全性,本文采用置乱—扩散机制设计一种新的图像加密算法.在像素置乱的过程中,通过Arnold变换和密钥序列排序的方法对图像各像素点位置进行两次置乱.像素值替代是通过对其二进制各位数字置乱后再与密钥序列的异或运算来实现的.而密钥序列都是通过L-L级联映射产生的伪随机序列.实验证明,这种加密算法加密效果好,能够抵御几种常见的攻击方式.

In order to improve the security of digital image in transmission,a novel image encryption algo-rithm based on the scrambled-diffusion mechanism is proposed in this paper. In the process of image pixelposition permutation,the pixels of the image are twice disordered by the sequence of the Arnold transforma-tion and key sequence.The pixel value of the image are substituted by scrambling the number of pixel in bi-nary and the XOR operation with key sequence. Pseudo-random sequences produced by the L-L cascademapping are used as key sequences.The experiment shows that the encryption algorithm has the advantage ofgood encryption effect and can resist several common cryptogram attacks.