摘要
本文提出一种基于位平面的一维混沌映射的图像加密算法,首先,对常见映射进行性能分析,指出其不足,通过在一维映射的基础上提出新的混沌映射,对其进行改进,改进后的映射在Lyapunov指数、分岔图上均表现出良好的随机性,并扩大了其混沌范围,然后,利用新的混沌映射设计了一种灰度图像加密算法,在置乱阶段采用位平面置乱,扩散阶段则在像素平面扩散,最后对本文提出的加密算法进行了相关的性能分析,如密钥分析、敏感性分析、统计分析等等,基于所有仿真实验分析,本文所提出的算法,在数字图像加密中具有较好的性能。
This paper presents a novel bit-level image encryption algorithm based on improved one-dimen- sional chaotic maps. Firstly, we improve some typical 1D chaotic maps. Simulations and perfor-mance evaluations show that the improved chaotic maps own better chaotic performances and larger chaotic ranges compared with the conventional chaotic maps. Then, a novel bit-level image encryption algorithm is designed using the improved chaotic systems. Bit-level shuffling is adopted at the stage of scrambling and pixel-level bitxor operation is performed at the diffusion phase. The simulation results and performance analysis show that the proposed image encryption algorithm is both secure and reliable for image encryption.
出处
《计算机科学与应用》
2018年第2期139-153,共15页
Computer Science and Application