【摘要】 针对当前图像信息在传播过程中隐私内容泄露导致的安全性问题,本研究提出了一种新的灰度图像加密算法。首先采用四维Henon映射迭代产生随机混沌序列用于随机扩散,以降低邻近像素点的相关性;然后采用Logistic映射产生用于控制置乱索引的混沌序列,实现在位平面内及位平面间的随机位级块置乱。相比传统图像加密算法一般采用逐像素置乱扩散,本研究的加密算法基于扩散-置乱结构的块算法,加解密过程简单,执行时间较短,且不会随着图像尺寸增大而大幅增加。仿真结果和安全实验分析表明,该加密算法密钥敏感性和安全性很高,能抵抗多种攻击手段。更多还原

【Abstract】 Aiming at the security problem of current image information caused by privacy disclosure in dissemination process, a new grayscale image encryption algorithm was proposed. Firstly, the four-dimensional Henon mapping was used to iteratively generate random chaotic sequences for random diffusion to reduce the correlation of neighboring pixels. Logistic mapping was then used to generate a chaotic sequence for controlling the scrambling index, so as to achieve random block scrambling in a bit plan and among bit planes. The traditional image encryption algorithm was generally per-pixel scrambling and diffusion. Encryption algorithm in this stady is a block algorithm based on the diffusion-scrambling structure. The encryption and decryption process is simple, the execution time is short and will not increase significantly as the image size increases. Simulation results and experimental analysis showed that the encryption algorithm has high key sensitivity and high security, it can resist multiple attack methods.更多还原