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Key Management for Outsourced data security

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Wuhan University Journal of Natural Sciences 2014年第5期19卷 449-454页

作者： PEI Bei CHEN Changsong WAN Changsheng The Third Research Institute of ministry of public security School of Information Science and Engineering Southeast University

This paper analyzes the efficiency and security of bi- linear-map-based schemes and brings about an AAA based publicly auditable scheme for cloud computing, which is much more efficient. In this scheme, a trust model including four entities is designed to provide both integrity and confidentiality protection. The proposed scheme can be proved to achieve the security goals that no cheating cloud server can pass the auditing without storing users＇ data intact. The efficiency of the proposal is evaluated by analyzing the fulfillment of the design goals, including the computation cost, communication cost and storage cost of our scheme. This light weight publicly auditable Proof-of-storage scheme achieves security goals perfectly, and has an excellent efficiency performance superior to the current bilinear-map-based publicly auditable Proof-of-storage scheme.

关键词： cloud computing malicious cloud server key management

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data security and Privacy in Bitcoin System:A Survey

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Journal of Computer Science & Technology 2020年第4期35卷 843-862页

作者： Lie-Huang Zhu Bao-Kun Zheng Meng Shen Feng Gao Hong-Yu Li Ke-Xin Shi School of Computer Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Information Management for Law China University of Political Science and LawBeijing 102249China Key Laboratory of Information Network security Ministry of Public SecurityShanghai 201204China

To date,bitcoin has been the most successful application of blockchain technology and has received considerable attention from both industry and *** is an electronic payment system based on cryptography rather than on *** of whether people are in the same city or country,bitcoin can be sent by any one person to any other person when they reach an *** market value of bitcoin has been rising since its advent in 2009,and its current market value is US160 *** its development,bitcoin itself has exposed many problems and is facing challenges from all the sectors of society;therefore,adversaries may use bitcoin's weakness to make considerable *** survey presents an overview and detailed investigation of data security and privacy in bitcoin *** examine the studies in the literature/Web in two categories:1)analyses of the attacks to the privacy,availability,and consistency of bitcoin data and 2)summaries of the countermeasures for bitcoin data *** on the literature/Web,we list and describe the research methods and results for the two *** compare the performance of these methods and illustrate the relationship between the performance and the ***,we present several important open research directions to identify the follow-up studies in this area.

关键词： security privacy bitcoin availability consistency

Collection and Judgment of Electronic data Evidence in Criminal Cases:From the Perspective of Investigation and Evidence Collection by public security Organs

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Journal of Forensic Science and Medicine 2019年第4期5卷 187-194页

作者： Bo Wang Yuxian Liu Department of Hunan public security The Comprehensive Case Handling CenterThe Network Technology TeamHunanChina Department of Hunan Provincial public security Police of The Legal CorpsHunanChina

With the continuous progress ofscience and technology,the Internet has gradually entered every field of daily *** addition to the information generated by the Internet in the form of digitization,it has become the main media for people to store *** the field of criminal offenses,the network is likely to be used to perpetrate criminal schemes,implement crimes,or help hinder investigations *** acts will leave an electronic data trail,such as WeChat information,emails,or *** a crime occurs,an evidence investigator should accurately,timely,and comprehensively obtain all electronic data related to the case by collecting,extracting,and transferring this data according to the law,and examining the authenticity,legality,and relevance of the *** a comprehensive review,the investigator should clarify the relationship between the electronic data and the facts to be proved and make full use of the obtained electronic evidence in criminal proceedings.

关键词： Authenticity collection electronic data extraction

An incentive-compatible rational secret sharing scheme using blockchain and smart contract

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Science China(Information Sciences) 2021年第10期64卷 221-241页

作者： Zerui CHEN Youliang TIAN Changgen PENG State Key Laboratory of public big Date College of Computer Science and Technology Guizhou University Institute of Cryptography and data security Guizhou University

In the rational cryptographic protocol, the two rational players often fall into the prisoner’s dilemma, which is also the case for the rational secret sharing we consider in this paper. First, it is proved that rational secret sharing has a sequential equilibrium in the natural state, so that rational participants will fall into the prisoner’s dilemma, resulting in no participants being able to reconstruct the secret ***, to solve this problem, we propose an incentive-compatible rational secret scheme. Specifically, the game tree with imperfect information is constructed to facilitate our analysis and proof, and the strictly dominated strategies are directly eliminated to simplify the game tree. Further more, we describe the motivation of the verifier. Then, we prove that rational players have no motivation to deviate from honest behavior using sequential equilibrium so that rational players can reconstruct the secret correctly. Finally, we complete the simulation using the smart contract and analyze our entire scheme. In addition, the game of our scheme does not need to be repeated multiple times to reach sequential equilibrium, i.e., the game always follows the rational path.

关键词： rational secret sharing game theory sequential equilibrium incentive-compatible smart contract

A novel algorithm for ocean wave direction inversion from X-band radar images based on optical flow method

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Acta Oceanologica Sinica 2018年第3期37卷 88-93页

作者： WANG Li CHENG Yunfei HONG Lijuan LIU Xinyu Third Research Institute Ministry of Public Security

As one of the important sea state parameters for navigation safety and coastal resource management, the ocean wave direction represents the propagation direction of the wave. A novel algorithm based on an optical flow method is developed for the ocean wave direction inversion of the ocean wave fields imaged by the X-band radar continuously. The proposed algorithm utilizes the echo images received by the X-band wave monitoring radar to estimate the optical flow motion, and then the actual wave propagation direction can be obtained by taking a weighted average of the motion vector for each pixel. Compared with the traditional ocean wave direction inversion method based on frequency-domain, the novel algorithm is fully using a time-domain signal processing method without determination of a current velocity and a modulation transfer function（MTF）. In the meantime,the novel algorithm is simple, efficient and there is no need to do something more complicated here. Compared with traditional ocean wave direction inversion method, the ocean wave direction of derived by using this proposed method matches well with that measured by an in situ buoy nearby and the simulation data. These promising results demonstrate the efficiency and accuracy of the algorithm proposed in the paper.

关键词： X-band radar optical flow weighted average ocean wave direction radar image

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An Efficient Steganalysis Model Based on Multi-Scale LTP and Derivative Filters

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Computers, Materials & Continua 2020年第3期62卷 1259-1271页

作者： Yuwei Chen Yuling Chen Yu Yang Xinda Hao Ning Wang Guizhou University Guizhou Provincial Key Laboratory of Public Big DataGuiyang550025China Information security center Beijing University of Posts and TelecommunicationsBeijing100876China

Local binary pattern(LBP)is one of the most advanced image classification recognition operators and is commonly used in texture detection *** indicates that LBP also has a good application prospect in ***,the existing LBP-based steganalysis algorithms are only capable to detect the least significant bit(LSB)and the least significant bit matching(LSBM)*** solve this problem,this paper proposes a steganalysis model called msdeLTP,which is based on multi-scale local ternary patterns(LTP)and derivative *** main characteristics of the msdeLTP are as follows:First,to reduce the interference of image content on features,the msdeLTP uses derivative filters to acquire residual images on which subsequent operations are ***,instead of LBP features,LTP features are extracted considering that the LTP feature can exhibit multiple variations in the relationship of adjacent ***,LTP features with multiple scales and modes are combined to show the relationship of neighbor pixels within different radius and along different *** and simulation show that the msdeLTP uses only 2592-dimensional features and has similar detection accuracy as the spatial rich model(SRM)at the same time,showing the high steganalysis efficiency of the method.

关键词： Image steganalysis LTP multi-scale image residuals

An Overview of General Theory of security

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China Communications 2017年第7期14卷 1-10页

作者： Min Lei Yixian Yang Xinxin Niu Yu Yang Jie Hao Information security center Beijing University of Posts and Telecommunications Guizhou University Guizhou Provincial Key Laboratory of Public Big Data Jiangsu Engineering center of Network Monitoring Nanjing University of Information Science & Technology

Cyber security lacks comprehensive theoretical guidance. General security theory, as a set of basic security theory concepts, is intended to guide cyber security and all the other security work. The general theory of security aims to unify the main branches of cyber security and establish a unified basic theory. This paper proposal an overview on the general theory of security, which is devoted to constructing a comprehensive model of network security. The hierarchical structure of the meridian-collateral tree is described. Shannon information theory is employed to build a cyberspace security model. Some central concepts of security, i.e., the attack and defense, are discussed and several general theorems on security are presented.

关键词： cyber security network attack and defense meridian-collateral theory

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Video Stabilization via Prediction with Time-Series Network and Image Inpainting with Pyramid Fusion

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Chinese Journal of Electronics 2021年第6期30卷 1103-1110页

作者： CHENG Keyang LI Shichao RONG Lan WANG Wenshan SHI Wenxi ZHAN Yongzhao School of Computer Science and Communication Engineering Jiangsu University Jiangsu Province big data Ubiquitous Perception and Intelligent Agricultural Application Engineering Research center Cyber Space security Academy of Jiangsu University National Engineering Laboratory for public Safety Risk Perception and Control by big data Xinjiang Lianhaichuangzhi Information Technology Co. Ltd.

Due to the poor filling effect of the video image defect commonly used in the video stabilization field, the video is seemed still unstable after the image stabilization process, which seriously affects the visual effect. To solve this problem, we improve a video stabilization method based on time-series network prediction and pyramid fusion restoration is proposed to optimize the visual effect after image *** flow of the proposed method is as follows: First,it is adaptive to determine whether the defect of the corresponding frame at the current time needs padding inpainting. Then, for the frame that needs to be inpainting,the frames generated before the current moment are sent to the model combining the convolutional neural networks and the gate recurrent unit to predict the part to be filled. Next the current defect image and the complete image to be filled are brought into the Laplacian pyramid reconstruction, and the improved weighted optimal suture is introduced for splicing during the fusion. Finally, the video frame is cut after reconstruction. The method is tested on a data set composed of videos commonly used in the field of video stabilization. The experimental results show that the average peak signal to noise ratio of the method is 2 to 5 d B higher than that of the comparison algorithm, and the average structural similarity index is improved by about 2% to 7% compared with the contrast algorithm.

关键词： image restoration image sequences video frame cutting improved weighted optimal suture gate recurrent unit video signal processing video stabilization method image fusion Laplacian pyramid reconstruction padding inpainting image resolution neural nets convolutional neural networks video image defect pyramid fusion restoration image inpainting visual effect optimization image reconstruction time-series network prediction image stabilization process

Image Inpainting Based on Improved Deep Convolutional Auto-encoder Network

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Chinese Journal of Electronics 2020年第6期29卷 1074-1084页

作者： QIANG Zhenping HE Libo DAI Fei ZHANG Qinghui LI Junqiu College of big data and Intelligent Engineering Southwest Forestry University Information security College Yunnan Police College

This paper proposes an effective image inpainting method using an improved deep convolutional auto-encoder *** analogy with exiting methods of image inpainting based on auto-decoders,inpainting methods using the deep convolutional auto-encoder networks are significantly more effective in capturing high-level features than classical methods based on ***,the inpainted regions would appear blurry and global *** alleviate the fuzzy problem,we improved the network model by adding skip connections between mirrored layers in encoder and decoder stacks,so that the generative process of the inpainting area can directly use the low-level features information of the processing *** making the inpainted result look both more plausible and consistent with its surrounding contexts,the model is trained with a combination of standard pixel-wise reconstruction loss and two adversarial losses which ensures pixel-accurate and local-global contents *** extensive experimental on the ImageNet and Paris Streetview datasets,we demonstrate qualitatively and quantitatively that our approach performs better than state of the art.

关键词： Image inpainting Convolutional autoencoder network Image completion Skip connections