基于激光散斑和超混沌的彩色图像加密  

Color image encryption based on laser speckle and hyper chaos

作　　者：贺锋涛 尹娇 段作梁 王鸿喜 湛飞 HE Feng-tao;YIN Jiao;DUAN Zuo-liang;WANG Hong-xi;ZHAN Fei(College of Electronic Engineering,Xi＇an University of Post and Telecommunications,Xi＇an 710061,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710061

出　　处：《光电子．激光》2018年第11期1244-1250,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61201193)资助项目

摘　　要：为了保证彩色图像在传输过程中的安全性与可靠性,提出将具有随机性的激光散斑与一种四维Lorenz型超混沌系统相结合进行彩色图像加密的新方法,同时构建了散斑超混沌加密系统。系统将原始彩图与超混沌系统产生的非线性度更高的超混沌序列按位异或进行混沌加密,然后将加密后的图像与物理随机的激光散斑图像按位异或进行散斑加密即可获得加密彩图,密钥空间达10101,平均相邻像素相关系数达0.000 4。结果表明,本文方法具有较好的加密效果,可抵御统计分析攻击,有大的密钥空间,较强的密钥敏感性及弱的相邻像素相关性。In order to make sure the security and reliability of color image in the process of transmission, this paper presents a method that laser speckle and a 4-dimensional Lorenz hyper chaotic system are mixed and applied to the color image encryption. At the same time,it constructs a speckle hyper chaotic encryption system. This system realizes chaotic encryption by making bitwise exclusive or the original color picture and nonlinear chaotic sequence from hyper chaotic system. Then by making bitwise exclu- sive or chaotic encryption image with physical random laser speckle image to achieve speckle encryption, the encrypted color image is generated. Its key space is 10^101 and the average correlation of adjacent pixel is 0. 000 4. The results demonstrate that this method has a good encryption effect,it can resist the statis- tical attack, has large key space, strong key sensitivity and weak correlation of adjacent pixels.

关 键 词：激光散斑 超混沌 按位异或 彩图加密 信息安全 

分 类 号：TN249[电子电信—物理电子学]