基于分数阶Chen系统的图像加密新算法

提出了一种基于分数阶Chen系统的图像加密新算法。首先利用分数阶Chen系统产生所需的置乱序列;然后通过对明文信息的判断来完成行列置乱序列的选择,从而保证了其与明文的相关性;对置乱后的图像采用分组异或的算法对其像素值进行预处理,同时对预处理后的图像进行两轮像素加密,增加了算法的复杂度和安全性。最后通过与整数阶Chen系统算法进行比较可知该算法具有密文相关度低,密钥空间更大,安全性更高等优点。

New image encryption method based on fractional order Chen system

A new image encryption algorithm is proposed based on fractional order Chen system. The fractional order Chen system produces the scrambling sequence which is required firstly. Then the selection of the scrambling sequence of row and column is completed through the judgment of the plaintext message, which ensures that it is associated with the plaintext. After preprocessing the pixel values of the scrambling image by using the algorithm of grouping XOR, Two rounds of encryption are used in the pretreatment image, which increases the complexity and security of the algorithm. Finally the comparison with the integer order Chen system algorithm shows that the algorithm has a low correlation to the ciphertext, larger key space and higher security.