一种基于混合混沌序列的图像加密方法

Image encryption algorithm based on mixed chaotic sequence

给出了一种基于Henon映射、Logistic映射和Lorenz系统三种混沌动力系统的图像加密算法。该算法用两个离散混沌系统Henon映射和Logistic映射组合来驱动一个连续Lorenz系统,用得到的信号对图像进行加密。对该系统进行数值实验和安全性分析,结果表明该系统不但拥有大的密钥空间,而且对密钥和明文很敏感,具有优良的扩散性能和扰乱性能。另外,具有较好的加密效果和加密效率,并对统计分析具有较好的安全性。

A new image encryption algorithm based on Henon map, Logistic map and the Lorenz system is presented. The output sequence generated by the continuous system of Lorenz drived by two discrete chaotic map, Logistic map and nenon map .Then, the plain image was encrypted by masking with the output sequence. The results of simulation experiments and security analyses indicate that this encryption system not only has a large key space but also has a very sensitivity with respect to the secret key and the original image. The encryption system proposed in this paper possesses perfect diffusion and confusion properties. Otherwise, the algorithm not only has good encryption effects and efficiency but also a better security performance to statistical analysis.