摘要
根据高维混沌系统具有更高安全性的特点,提出一种基于统一混沌系统和广义猫映射的彩色图像加密新算法。该算法先利用广义猫映射分别实现空域彩色图像三基色置乱变换,然后由统一混沌系统输出的三维混沌序列分别实现空域彩色图像三基色逐像素替代变换。研究结果表明,该算法具有良好的像素值混淆、扩散性能和较大的抵抗强力攻击的密钥空间,加密图像像素值具有类随机均匀分布特性,且相邻像素的值具有零相关特性,证明了所提出方案具有较高的安全性。
According to the characteristic of higher secrecy of high-dimension chaotic system, a new colour image encryption algorithm based on unified chaotic system and general cat maps was proposed. Firstly, tricolor scrambling transformation was realized respectively in space domain by using the general cat maps. Then the three chaotic sequences of unified chaotic system were adopted to realize the tricolor Substitution transformation pixel by pixel. The results demonstrate that the algorithm has good properties of confusion and diffusion. The key space is large enough to resist the brute-force attack. For the encrypted image the distribution of pixel-values has a random-like behavior and the values of adjacent pixels satisfy zero correlation, showing that the proposed scheme is of high security.
出处
《计算机应用》
CSCD
北大核心
2007年第8期1888-1890,1894,共4页
journal of Computer Applications
基金
湖南省自然科学基金资助项目(06JJ5098)
湖南省教育厅科研基金资助项目(06A031)
关键词
彩色图像加密
统一混沌系统
广义猫映射
三基色置乱
colour image encryption
unified chaotic system
general cat map
tricolor scrambling
