基于组合混沌系统的彩色图像加密算法

Color image encryptionalgorithm based on multi-chaotic system

为了提高彩色图像信息的安全性,针对单一混沌系统的不足,提出一种基于组合混沌系统的彩色图像加密算法。首先将明文图像变化成为红(R)、绿(G)和蓝(B)三个分量,并采用小波变换分别对R,G,B三个分量进行分解,然后采用不同混沌系统对R,G,B三个分量的低频系统分别进行置乱处理,并采用小波重构得到加密后R,G,B分量,最后对组合R,G,B进行随机排列,得到密文图像,并采用仿真实验测试算法的性能。仿真结果表明,相对其它彩色图像加密算法,本文算法获得了更加理想的图像加密效果,在提高密钥空间的同时,抗攻击能力得到大幅度提升。

In order to improve the security performance of color image, a novel color image encryption algorithm based on multi-chaotic system is proposed in this paper. Firstly, R, G, B components are obtained from original color image, and wavelet transform is used to decompose the R, G, B components, and then different chaotic systems is a_dopt to scramble the R, G, low frequency of three components and the wavelet transform is used to reconstruct encrypt_ed R, G, B component, finally, the R, G, B is combined randomly to get the encryption image, and the performance is test by simulation experiments. The results show that, compared with other color image encryption algorithms, the proposed algorithm can obtain a more ideal image encryption effect in improving the key space and greatly enhance the anti attack capability.