一种无损伤的图像加密算法及其实现  

A lossless image encryption algorithm and its implementation

作　　者：吕翔[1] 杨刘洋 刘中帅 

机构地区：[1]浙江师范大学数理与信息工程学院,浙江金华321004 [2]重庆市潼南中学,重庆402660

出　　处：《浙江师范大学学报（自然科学版）》2017年第2期153-160,共8页Journal of Zhejiang Normal University:Natural Sciences

基　　金：浙江省科技厅创新团队项目(2010R5007)

摘　　要：针对一些图像加密算法计算量大、安全性低、密钥数量大和图像部分信息丢失等缺点,提出了一种无损伤的图像加密算法.先将目标图像与拉丁方按位进行异或运算可得初始加密图像,以实现第1步像素值变换加密处理,可减小计算量,并初步提高安全性.再对初始加密图像按照循环自正交拉丁方的数对方阵规律进行第2步像素空间位置变换加密处理,可得最终加密图像,使得图像的安全性更高.仿真实验及结果分析表明:该算法不仅具有安全性高,加/解密效果理想,便于实现等优点,还能抵抗多种攻击,是一种安全实用的无损伤图像加密算法,在高精度图像加密中具有更加广阔的应用前景.According to the disadvantages of some image encryption algorithm such as long computation time consumption, low security performance and large number of secret keys requirement and partial information loss, a novel lossless image encryption algorithm was proposed. Firstly, XOR operation was carried out between a selected Latin square and the target image to get the encrypted image. Secondly, scrambling encryption was performed for this image by using a number pair matrix which was generated by a cyclic self-orthogonal Latin square for improving the security. Simulation results and parameter analysis indicated that this algorithm had advantages of high security, attractive performance at encryption/decryption, easy to implement and high resistance of many kinds of attack. Thus, this algorithm was an effective lossless encryption algorithm and had wide application in high precision image encryption.

关 键 词：图像处理 信息隐藏 拉丁方 循环自正交拉丁方 仿真实验 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]