一种基于混沌与Bit位扰乱的彩色图像加密算法

A Color Image Encryption Algorithm Based on Chaos and Bit Disturbance

本文提出了一种基于改进的Henon混沌映射与Bit位扰乱的彩色图像加密算法。首先,我们把明文图像的R、G、B三个通道合并成一个矩阵,同时还把其转换成二进制数;其次,把二进制数矩阵的行列进行扰乱,并把扰乱了的二进制数矩阵还原成十进制数矩阵;最后,把其分成三个像素个数相同的矩阵,再分别把三个矩阵进行按位“异或”运算,得到最终加密图像。实验结果和理论分析表明该算法具有密钥空间大,密钥敏感性高,能够有效地抵御统计分析和灰度值分析的攻击,对数字图像的加密具有良好的加密效果。

In this paper, we propose a color image encryption algorithm based on improved Henon chaotic map and Bit scrambling. First, we combine the three channels R, G, and B of the plaintext image into a matrix, and also convert it into a binary number. Secondly, the rows and columns of the binary number matrix are disturbed, and the disturbed binary number matrix is restored to a decimal number matrix. Finally, it is divided into three matrices with the same number of pixels, and then the three matrices are subjected to a bitwise XOR operation to obtain the final encrypted image. The experimental results and theoretical analysis demonstrate that the algorithm has a large key space. It can effectively resist the attacks of statistical analysis and gray value analysis, and has a good encryption effect on digital image encryption.