适用于矩形图像的新二维映射图像加密算法  

Image encryption algorithm based on new two-dimensional map for rectangular image

作　　者：任洪娥[1] 尚振伟[1] 张健[1] 

机构地区：[1]东北林业大学信息与计算机工程学院,黑龙江哈尔滨150040

出　　处：《光学精密工程》2008年第8期1483-1489,共7页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.30771679);国家948计划资助项目(No.2005-4-62)

摘　　要：针对目前的图像加密方法大多只局限于对方形图像进行加密的特点，提出了一种同时适用于方形图像和矩形图像的加密算法。将基于图像分割的新二维映射用于图像位置置乱，将含有混沌映射的扩散函数用于图像灰度置乱，从而得到一种位置置乱和灰度置乱相结合的图像加密算法。实验仿真结果表明，该算法能够很好地实现对任意大小的方形和矩形图像进行加密，且具有密钥空间大（10^15～10^30），密钥敏感性强以及能够抵御统计和已知明文攻击等优点，基本满足图像加密的有效性和安全性要求。A new encryption algorithm was proposed to apply to both square and rectangular image en- cryptions. A new twoimensional map based on image segmentation was applied to the location scrambling, and a spread function containing chaos map to the gray scrambling, so that an image encryption algorithm combined with both position and gray scramblings was obtained. The experimental simulation shows that this algorithm can achieve good image encryption for any size of square and rec- tangular images with a large key space （10^15-10^30 ）. Proposed algorithm also has advantages in withstanding statistical and known plaintext attack, which basically satisfies the requirements of validity and safety for image encryption.

关 键 词：图像加密 矩形图像 置乱 扩散 混沌映射 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]