基于系数融合与锯齿填充曲线的双图像加密算法

为了实现对两幅图像同步加急，有效降低传输负载，提出了系数融合模型与锯齿填充的双图像加密算法。首先，引入离散余弦变换DCT与Zigzag 扫描机制，获取输入明文的系数矩阵，建立明文系数融合模型，将两个明文矩阵转换成融合矩阵，借助逆向离散余弦变换，获取复合图像；随后，设计锯齿填充曲线，对复合图像的像素位置进行扰乱，形成置乱图像；最后，改进引力模型，对置乱图像进行扩散，改变其灰度值。实验结果显示，本算法能够对两幅图像进行同步加密，且具有较高的安全性与密钥敏感性，解密图像的信息损失很小。

Double image encryption algorithm based on coefficient fusion and saw tooth filling curve

In order to realize the synchronization of two images urgently, effectively reduce the transmission load, the double image encryption algorithm based on coefficient fusion model and saw tooth filling curve was proposed in this paper. Firstly, the coefficients matrix of the input plain was obtained by discrete cosine transform DCT and Zigzag scanning mechanism, and the two plain matrix is transformed into a fusion matrix by constructing the coefficient fusion model, then the composite image was obtained by inverse discrete cosine transform. Subsequently, the design of the zigzag filling curve, the pixel location of the composite image to disturb the formation of scrambling image. Finally, the improved gravity model, the scrambled image diffusion, changes the gray value. The experimental results show that the algorithm can be used to encrypt the two images simultaneously, and it has high security and no loss of information.