摘要： 现有结合混沌系统和DNA计算的图像加密算法因DNA编码规则和运算规则单一、加密结构安全性低,导致算法易被破解。为此,提出一种结合Intertwining Logistic映射和动态DNA编码与运算的彩色图像加密算法。该算法包括置乱阶段和扩散阶段,在置乱阶段,利用模拟退火算法构造的置乱序列分别对彩色图像信道进行行和列置乱,得到置乱信道。在扩散阶段,先根据随机序列值动态选择各置乱信道每个像素点的DNA编码规则及运算规则,然后结合密文反馈机制进行DNA加密计算。实验结果表明,该算法具有良好的抗攻击能力及加密效果。

关键词: Intertwining Logistic映射, DNA编码, DNA计算, 图像加密, 安全性分析

Abstract: Aiming at the problem that the chaos based image encryption algorithm combined with DNA coding can be broken caused by incorrect use of DNA coding rules and calculation methods,a new image encryption algorithm combined Intertwining Logistic mapping and dynamic DNA coding is proposed in this paper.This algorithm includes a scrambling phase and a diffusion phase.In the scrambling phase,the rows and columns of each channel of the color image are scrambled via scrambling sequences constructed by the simulated annealing algorithm.In the diffusion phase,the DNA coding rules and calculation rules of each pixel are determined according to the random sequence values,and then the DNA encryption is carried out.Experimental results show that this algorithm can resist against common attacks and have an excellent performance.

Key words: Intertwining Logistic mapping, DNA coding, DNA calculation, image encryption, safety analysis

中图分类号: 

• TP391