TPE-H2MWD:an exact thumbnail preserving encryption scheme with hidden Markov model and weighted diffusion

查看全文 作　　者：Xiuli [1,2]CHAI;Xiuhui [1]CHEN;Yakun [1]MA;Fang [1]ZUO;Zhihua [2,3]GAN;Yushu [4]ZHANG 机构地区：[1]School of Artificial Intelligence,Henan Engineering Research Center for Industrial Internet of Things,Henan University,Zhengzhou,450046,China;[2]Henan Key Laboratory of Cyberspace Situation Awareness,Zhengzhou,450001,China;[3]School of Software,Intelligent Data Processing Engineering Research Center of Henan Province,Institute of Intelligent Network System,Henan University,Kaifeng,475004,China;[4]College of Computer Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing,211106,China 出　　处：《Frontiers of Information Technology & Electronic Engineering》索引2023年第24卷第8期,共12页 基　　金：supported by the Pre-research Project of Songshan Laboratory,China(No.YYJC012022011);the Postgraduate Education Reform and Quality Improvement Project of Henan Province,China(Nos.YJS2022JD26 and SYLAL2023020);the Postgraduate Education Innovation Training Base,China(No.SYLJD2022008);the Science and Technology Project of Henan Province,China(Nos.232102210109 and 232102210096);the Open Foundation of Henan Key Laboratory of Cyberspace Situation Awareness,China(No.HNTS2022019)。 摘　　要：With the substantial increase in image transmission,the demand for image security is increasing.Noise-like images can be obtained by conventional encryption schemes,and although the security of the images can be guaranteed,the noise-like images cannot be directly previewed and retrieved.Based on the rank-then-encipher method,some researchers have designed a three-pixel exact thumbnail preserving encryption(TPE2)scheme,which can be applied to balance the security and availability of images,but this scheme has low encryption efficiency.In this paper,we introduce an efficient exact thumbnail preserving encryption scheme.First,blocking and bit-plane decomposition operations are performed on the plaintext image.The zigzag scrambling model is used to change the bit positions in the lower four bit planes.Subsequently,an operation is devised to permute the higher four bit planes,which is an extended application of the hidden Markov model.Finally,according to the difference in bit weights in each bit plane,a bit-level weighted diffusion rule is established to generate an encrypted image and still maintain the same sum of pixels within the block.Simulation results show that the proposed scheme improves the encryption efficiency and can guarantee the availability of images while protecting their privacy. 关 键 词：Hidden Markov model Weighted diffusion Balance between usability and privacy Image encryption