一种基于位运算的数字图像加密算法  

An Image Encryption Algorithm Based on Bit-Computation

作　　者：谢勰[1] 范九伦[1] 

机构地区：[1]西安邮电学院信息与控制系,陕西西安710061

出　　处：《微电子学与计算机》2009年第12期117-119,124,共4页Microelectronics & Computer

基　　金：陕西省自然科学基金项目(SJ08F24);陕西省教育厅专项科研计划项目(09JK731);西安邮电学院中青年科研基金(ZL2009-16)

摘　　要：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.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.

关 键 词：图像加密 混沌系统 位运算 非线性离散化 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]