基于SHA-3与DNA编码混沌系统的输电线路图像加密算法研究

针对输电线路巡检中无人机采集的图像数据存在的安全与加密效率问题,文中提出一种SHA-3算法与DNA编码混沌系统相结合的图像加密算法。首先,为加强密钥对图像明文的敏感性,利用SHA-3算法生成巡检图片的哈希值作为超混沌系统的初始值密钥；然后,根据对角线提取规则将图片进行像素块置乱,并使用超混沌系统生成的混沌序列映射DNA编码规则,对置乱完毕的巡检图片进行DNA编码、运算与解码,实现巡检图像的加密与解密；最后,为验证文中方法的有效性以及优越性,以某国网公司实际巡检图像数据为基础,设置密钥空间、密钥敏感性、直方图、信息熵、加密时效等实验对算法进行测试分析,结果表明该算法相较传统算法安全性更高的同时,具有较好的实时性,可胜任实际巡检中的图像加密任务,为输电线路巡检图像加密任务提供了新的思路和技术方法。

Research on Transmission line image encryption Algorithm based on SHA-3 and DNA encoded chaotic system

Aiming at the problems of security and encryption efficiency of image data collected by UAV in transmission line inspection, an image encryption algorithm combining SHA-3 algorithm and DNA encoded chaos system is proposed in this paper. Firstly, in order to enhance the sensitivity of the key to the plaintext of the image, sha-3 algorithm was used to generate the hash value of the inspection image as the initial key of Chen hyperchaos system. Then, pixel blocks are scrambled according to the diagonal extraction rules, and the chaotic sequence mapping DNA coding rules generated by Chen hyperchaos system are used to encode, calculate and decode the scrambled inspection images, so as to realize the encryption and decryption of the inspection images. Finally, to verify the validity of the proposed method and the superiority, to a certain SGC actual inspection image data as the foundation, set up the key space, key sensitivity, histogram, information entropy, encryption aging experiment to test and analysis of algorithms, the results show that the algorithm is compared with the traditional algorithm of security is higher, at the same time has good real-time performance, It is capable of the image encryption task in the actual inspection and provides a new idea and technical method for the image encryption task of transmission.