一种基于位运算的数字图像加密算法

给出了一种混沌序列的非线性二值化方法,提出了一种基于位运算的数字图像加密算法.加密算法首先利用传统的混沌系统产生的混沌序列对图像进行位置置乱;其次对置乱后图像进行基于灰度值二进制序列的置乱操作;最后应用文中方法对结果图像灰度值的二进制序列按位进行异或运算.实验结果表明,该加密算法具有良好的安全性和加密效果.

An Image Encryption Algorithm Based on Bit-Computation

A nonlinear bit sequences generating algorithm based on chaotic system is presented, and an image encryption algorithm based on bit - computation is presented as well. Firstly, the image is pretreated by permutation based on chaotic system; secondly the bit sequence obtained by the pixel gray value are also be permuted; finally, the bit sequence is operated by XOR with the pseudo - random sequence generated from the chaotic system, and the encrypted image is obtained. Simulation results show that the algorithm is more efficient and secure.