摘要
基于分数阶Fourier变换和混沌,提出了一种数字图像加密方法。具体算法为:先对图像进行混沌置乱,再进行X方向的离散分数阶Fourier变换;然后在分数阶Fourier域内作混沌置乱,再进行Y方向的离散分数阶Fourier变换;最后将加密图像的实部与虚部映射到RGB,形成可传输的彩色加密图像。实验结果表明,该加密算法具有很好的安全性,在信息安全领域有较好的应用前景和研究价值。
This paper proposed a new approach of digital image encryption based on the fractional Fourier transform and chaos.The algorithm could be summarized as follows.Firstly,scrambled the image in time domain with chaos,and then combined it and the discrete fractional Fourier transform in X direction.Secondly,scrambled the image obtained in the fractional Fourier domain with chaos,and then combined it and the discrete fractional Fourier transform in Y direction.Finally,mapped the real and image part of the encrypted image to the RGB,forming a color image for transmission.The experiment results show that the algorithm performs considerable security,which has well research value and application foreground in the information security field.
出处
《计算机应用研究》
CSCD
北大核心
2011年第7期2738-2741,共4页
Application Research of Computers
基金
国家自然科学基金资助项目(60873200)
"211工程"三期建设项目(S-10218)
中央高校基本科研业务费资助项目(CDJXS10181132)
关键词
图像加密
分数阶傅里叶变换
混沌
image encryption
fractional Fourier transform
chaos