复用技术耦合率失真优化的多图像加密算法

摘要

To synchronously encrypt multiple images and solve the crosstalk effects induced by adopting the compression idea in existed multi-image encryption algorithms,the multi-image encryption algorithm based on multiplexing technology coupled rate distortion optimization control was proposed.The multiplexing technology was designed based on DCT (discrete cosine trans-form)and ZigZag mechanism,as well as the angle rotation idea was adopted to take multi-images into one composite matrix,and the composite permutation image was obtained by IDCT (inverse discrete cosine transform).The rate distortion optimization controlling technique was designed to embed into the multiplexing technology for reducing the distortion.The encryption function was constructed to diffuse the permutation image.Simulation results show that this encryption mechanism is highly secure,com-pared with current multi-image encryption algorithm,the decryption quality of this algorithm is better with lossless distortion.%为对多图像进行同步加密，解决当前多图像加密算法因采用压缩思想导致的串扰效应，提出角度旋转复用技术耦合率失真优化控制的多图像同步加密算法。引入 DCT （discrete cosine transform）与 ZigZag 机制，基于角度旋转思想，设计复用技术，将多个明文转换成复合矩阵，借助 IDCT （inverse discrete cosine transform），形成置乱图像；设计率失真优化控制技术，嵌入复用技术中，减少失真度；构造加密函数，获取密文。仿真结果表明，该加密机制高度安全，与当前多图像加密机制相比，解密质量更高，失真度更小。