交替分段相互置乱的双混沌序列图像加密算法

基于混沌的图像加密方法在安全性、适应性上具有优势.文中在对原有的混沌图像加密算法安全性分析的基础上,提出了一种基于Logistic和Chebyshev双混沌映射的数字灰度图像加密算法.借助基于明文产生的辅助密钥、初始密钥以及由双混沌系统产生交替分段相互置乱的密码序列是本算法的核心.计算机仿真及统计特性、安全性分析表明,该加密算法具有良好的加密效果和较高的安全性能,密钥空间达到255×10120.

Image Encryption Algorithm Based on Reciprocally-Disordered Diploid Chaotic Sequences Alternated in Subsection

The security of the conventional image encryption algorithms based on chaotic systems is analyzed, then an image encryption algorithm based on compound logistic and chebyshev chaotic maps is put forward. The auxiliary and initial secret keys are in virtue of the original image and the reciprocally disordered cipher sequences alternated in subsection are generated by the compound chaotic systems, which are both the kernel parts in the proposed algorithm. The analysis and simulation results show that the proposed algorithm has an excellent effect of encryption, while the security of the encryption algorithm is relatively higher.