基于混沌符号动力学的图像加密研究

摘要

This paper proposes an algorithm to realize the image encryption with I-D piece-wise chaotic symbol dynamics.Based on the principle of chaotic symbol dynamics, the position and the value of each pixel are scrambled by different chaotic sequence, which are gotten from only one short chaotic sequence.To realize the image encryption, the encryption algorithm uses the chaotic sequence to determine the algorithm of interchanging the rows, uses the primary matrix which is determined by the different chaotic sequence to scramble the positon and the value of each pixel.Experimental result shows that the algorithm is good at the image scrambling, it is can be applied into the image encryption transmission or prepocessing of secret images in digital watermark.%结合混沌符号动力学原理及 1-D 分段线性映射混沌系统,提出一种能够实现数字图像加密的像素位和像素值的置乱算法.该算法利用混沌符号动力学原理,仅利用一个密钥参数便可完成多密钥的置乱加密过程,而且能同时完成像素位和像素值的不同密钥加密,大大加强了密钥的搜索空间,增强了抗破解的能力.实验结果表明,该算法具备实现简单、加密速度快、加密效果好等特点,可广泛应用于图像的加密传输、数字水印等隐蔽传输中的加密处理.