基于比特置换与核酸序列库的混沌图像加密算法  

Chaotic image encryption algorithm based on bit permutation and DNA sequence

作　　者：牛莹[1] 张勋才[1] NIU Ying;ZHANG Xuncai(College of Electric Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China)

机构地区：[1]郑州轻工业学院电气信息工程学院,郑州450002

出　　处：《计算机工程与应用》2017年第17期130-136,共7页Computer Engineering and Applications

基　　金：国家自然科学基金(No.61602424;No.61472371);河南省科技创新人才计划(No.174100510009);河南省高校科技创新人才支持计划(No.15HASTIT019)

摘　　要：提出了一种基于比特置换与DNA序列运算的混沌图像加密的算法。该算法首先利用Chen系统产生混沌映射索引对图像进行像素位置置乱,结合蝶形网络对比特位置乱,以实现位级别置乱。再对图像进行DNA编码,并与核酸序列进行代数运算,实现像素的替代,进一步提高了加密的安全性。最后通过密文反馈来进一步增强算法的混淆和扩散特性。实验和安全性分析结果表明,该算法不仅密钥空间大、对密钥的敏感性强,而且能有效抵御统计性分析和穷举分析等攻击操作。Digital image encryption technology is an effective means to protect digital image transmission.An image encryption algorithm based on bit permutation and DNA sequence operations is proposed in this paper.The algorithm firstly uses the Chen system to generate the chaotic map index to scramble the image pixels,and the butterfly network is used to implement the bit permutation.Then the image is coded into DNA matrix,and the algebraic operation is performed with the DNA sequence to realize the substitution of the pixels,which further improves the security of the encryption.Finally,the confusion and diffusion properties of the algorithm are further enhanced by the ciphertext feedback.Experimental results and security analysis show that the algorithm not only has a large key space,the sensitivity of the key,but also can effectively resist statistical analysis and exhaustive analysis attacks.

关 键 词：图像加密 比特置换 超混沌系统 DNA编码 DNA序列 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]