利用MGSA算法的光学图像加密增强方案

An Encryption Enhancement Scheme of Optical Image Using MGSA

针对JPEG图像加密方案的安全问题,在分析混沌映射和改进盖师贝格-撒克斯通(MGSA)算法的基础上,提出一种新的使用修改逻辑映射的图像加密方案.对图像生成的混沌序列进行置换、交换和随机扩散,在加密过程中进行交叉对比,并将混乱和扩散效应施加于图像上.文中分别从加密性、相关性、像素变化率(NPCR)和平均改变强度(UACI)等安全性指标对提出的方案与其他几种常用方案进行对比分析.实验结果表明,提出的光学图像加密方案具有更高可靠性.

Aiming at the security problem of JPEG image encryption method,a new image encryption scheme using modified logical mapping is proposed,which is based on analyzing chaotic map and modified Gerchberg-Saxton algorithm（MGSA）.The chaotic sequences generated by the image are replaced,exchanged and randomly diffused.The cross-contrasts are made in the process,and the chaos and diffusion effects are applied to the image.The safety indicators,such as encryption,correlation,NPCR,and UACI are used to compare the proposed method and several other commonly methods.The experimental results show that the optical image encryption scheme proposed in this paper has higher reliability than the other methods.