加密图像置乱性能分析

在对近年来的图像加密技术进行分析和研究的基础上,给出了几个图像置乱评价参数——不动点比、信息熵、灰度平均变化值及自相关度,并利用这些参数对传统的图像加密算法的置乱性能进行了模拟实验分析。分析及试验结果表明,综合利用这些参数可以有效地对加密图像的置乱度及安全性进行分析和评价。

Analysis of Scrambling Performance of Encrypted Image

With the rapidly development of network and multimedia technology,more and more image data transfer on Internet.In order to protect the privacy and to make the image data transfer more safely,a lot of schemes of image en- cryption are presented.To evaluate and analyze the scrambling perfermance and security of these schemes,some param- eters such as the percentage of unchanged point,the information entropy,the average of pixel values change and the self- correlation of image are given.The simulation results of the experiment indicate that these parameters can be effectively ued to evaluate scrambling performance and the security of encrypted image.