基于高维混沌系统的图像加密改进算法

为保证数字图像在传输过程中的安全问题,通过分析传统的基于高维混沌系统的图像加密算法,提出了一种图像加密改进算法。将位置置乱和像素替换加入到每次迭代中,并使加密数据流与明文信息相关,弥补了传统算法在应用中的漏洞和不足。理论分析和仿真实验表明,该算法具有良好的保密性和加密效果,密文对明文或初始密钥的任何微小变化具有强烈敏感性,相邻像素满足零相关性,具有较强的安全性和可操作性。

Improved Image Encryption Algorithm Based on High-Dimension Chaotic System

In order to solve the security problem during the transmission of digital image, according to the analysis of traditional image encryption using high-dimension chaotic system, an improved algorithm of image encryption is given. It combines the methods of position shuffling and pixel value substituting in iterations, and makes the encrypted datastream having relation to the plaintext. It resolved the bugs of traditional algorithm in application. The results of theoretical analysis and simulated experiment show that the algorithm guarantees the security of encryption effectively and excellent effect of encryption, the encrypted result varies sensitively with any minimal changes of the initial secret key and the plaintext,the value of adjacent pixels satisfy zero correlation, showing that the algorithm is feasible, security and easy to operate.