摘要
从分数阶傅里叶变换的性质出发,对一类分数阶傅里叶变换图像加密算法进行分析。对原有算法结果图进行肉眼判断,提取图像中间结果数据进行对比分析,可知算法的密钥具有不敏感性,并且解密图具有很大失真。对分数傅里叶变换进行理论上的分析和讨论。分析及实验结果表明,直接使用分数阶傅里叶变换进行加密的算法对密钥并不敏感,存在安全隐患。为实现密文图像的显示和传输而引入的RGB映射将导致解密图像像素值失真。
According to the properties of fractional Fourier transform, a kind of fractional Fourier transform image encryption algorithm is analyzed. The key is not sensitive and the deciphering diagram is of great distortion, when with the naked eye on results chart to judge and extract the image data for comparison. Theoretical analysis and experimental results show that the algorithm is not sensitive to the key when the fractional Fourier transform is directly applied to image encryption.The introduction of RGB mapping to realize the cipher image display and transmission, result a great distortion in pixels.
出处
《计算机工程与应用》
CSCD
北大核心
2015年第22期85-89,共5页
Computer Engineering and Applications
基金
国家自然科学基金(No.61001004)
湖南省教育厅项目(No.11B002)
湖南省海外名师项目(No.2013008)
关键词
图像加密
分数傅里叶变换
RGB映射
混沌序列
image encryption
fraction Fourier transform
RGB mapping
chaotic sequence
