基于激光散斑和超混沌的彩色图像加密

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。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。

Color image encryption based on laser speckle and hyper chaos

In order to make sure the security and reliability of color image in t he 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 origi nal color picture and nonlinear chaotic sequence from hyper chaotic system.Then by making bitwise exclusive or c haotic encryption image with physical random laser speckle image to achieve speckle encryption,the encrypted color image is generated.Its key space is 10¹⁰¹ and the average correlation of adjacent pixel is 0.0004.The results demonstrate that this method has a good encryption effect,it can resist the statistical attack,has large k ey space,strong key sensitivity and weak correlation of adjacent pixels.