基于非对称密码系统的彩色图像加密技术

Color image encryption technology based on asymmetric cryptosystem

为了实现对彩色图像的加密,提出一种基于傅里叶变换和非对称密钥加密系统的加密方法。把彩色图像分成三基色分量:红,绿,蓝。然后对这3帧灰度图像的傅里叶频谱进行截取,合成一个目标图像,该目标图像包含了原始彩色图像的大部分信息。对此目标图像的幅度和相位分别用非对称密钥加密系统加密,即实现了彩色图像的加密。给出了理论分析和计算机模拟结果,实验结果证实了该方法的可行性。

In order to encrypt color image, a method based on Fourier transform and asymmetric cryptosystem is proposed. Firstly, a color image is separated into three primary components： red, green, and blue. Then Fourier spectra of the three gray images are intercepted respectively and combined into a target image, and the target image contains most of the original color image information. The amplitude and phase of this target image are encrypted using asymmetric cryptosystem, which means the original color image is encrypted. In this paper, the theoretical analysis and computer simulation are proposed, and the experiment results verify the feasibility of this method.