摘要：

当前图像加密算法对多图像同步实时加密效率低、复杂度高,且无法满足实时传输要求。为此,提出一种基于显著像素复合矩阵的多图像同步无损实时加密算法。引入ZigZag机制扰乱所有明文像素位置,定义显著像素择取机制,将置乱后的密文像素分割为显著像素与次要像素,形成多个显著像素矩阵。设计迭代复数模型,将显著像素矩阵形成复合矩阵,借助奇异值分解与Logistic映射得到矩阵密钥。构造扩散函数,利用矩阵密钥对显著像素复合矩阵执行扩散获取密文。实验结果表明,该算法安全性高、无失真,与目前多图像加密机制相比,加密效率更高,可同时对多幅图像进行实时安全加密传输,满足实时性传输需求。

关键词: 多图像加密, 显著像素, 迭代复数模型, 奇异值分解, 矩阵密钥

Abstract:

In view of the current algorithm for multi-image synchronous real-time encryption has low efficiency,high complexity and cannot meet the requirements of real-time transmission problem.The selectively multi-image lossless real time encryption algorithm based on significant pixels composite matrix is proposed.All the pixels of plaintexts are permutated by introducing the Zigzag mechanism;the image pixels are divided into important pixels and unimportant pixels by defining the pixels of interest selection mechanism for getting several important pixels matrix;and the composite matrix is obtained by designing the iteration plural model.Using the singular value decomposition gets the key matrix.The cipher is formed by constructing the diffusion function to diffuse the significant pixel composite matrix.This algorithm only encrypts the image significant pixels,avoiding the diffusion of non-significant pixel,resulting in low complexity.Simulation results show that this algorithm has high security,and belongs to lossless encryption;comparison with other multi-image encryption mechanism,the encryption/decryption efficiency of this algorithm is higher to meet the requirement of real time transmission.

Key words: multi-image encryption, significant pixel, iteration plural model, singular value decomposition, matrix key

中图分类号: 

• TP391