基于DNA序列和动态索引扩散的图像加密算法

doi:10.16088/j.issn.1001-6600.2020080503

摘要/Abstract

摘要： 本文提出一种基于DNA序列和动态索引扩散的图像加密算法以提高加密算法的效率、增强加密算法的安全性。首先,采用SHA-256哈希函数产生与明文相关的初始值;然后,对明文图像进行随机编码得到DNA矩阵,使用新型混淆方案直接对DNA矩阵进行处理;之后,对混淆后的DNA矩阵进行随机解码得到中间密码图像;最后,利用动态索引扩散方案对中间密码图像进行扩散获得密文图像。实验结果及安全性分析表明,算法具有良好的加密效果,具有较高的敏感性,能够有效抵抗差分攻击、统计分析攻击等各种攻击。此外,该算法具有较高的加密效率,可满足实际应用的要求。

关键词: 图像加密, DNA序列, 哈希函数, 混淆, 动态索引扩散

Abstract: An image encryption algorithm based on DNA sequence and dynamic index diffusion is proposed to improve the efficiency and enhance the security of the encryption algorithm. Firstly, the SHA-256 hash function is used to generate the initial values related to plain image. Then, the plain-image is encoded into DNA matrix randomly. The DNA matrix is processed directly by using the new confusion method, and the confused DNA matrix is decoded randomly to obtain intermediate encrypted image. Finally, the intermediate encrypted image is diffused by using the dynamic index diffusion scheme to obtain the cipher image. Experimental results and security analysis prove that the encryption scheme has a good encryption effect, high key sensitivity, and can effectively resist various attacks, such as differential attack, statistical analysis attack, etc. In addition, the scheme has high encryption efficiency, which can meet the requirements of practical application.

Key words: image encryption, DNA sequence, hash function, confusion, dynamic index diffusion

中图分类号:

TP309.7

李蓝航, 丘森辉, 肖丁维, 黎亮佳, 欧阳雪, 罗玉玲. 基于DNA序列和动态索引扩散的图像加密算法[J]. 广西师范大学学报（自然科学版）, 2021, 39(3): 40-53.

LI Lanhang, QIU Senhui, XIAO Dingwei, LI Liangjia, OUYANG Xue, LUO Yuling. Image Encryption Algorithm Based on DNA Sequence and Dynamic Index Diffusion[J]. Journal of Guangxi Normal University(Natural Science Edition), 2021, 39(3): 40-53.

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