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11th International Workshop on Digital Forensics and Watermaking, IWDW 2012

作者： Liu, Feng Yan, Wei Q. Li, Peng Wu, Chuankun State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China School of Computing and Mathematical Sciences Auckland University of Technology 1142 New Zealand Department of Mathematics and Physics North China Electric Power University Baoding Hebei 071003 China

ISBN: (纸本)9783642400988

Visual Cryptography (VC) is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography with that of raster graphics. A binary image can be divided into shares that are able to be stacked together so as to approximately recover the original image. VC is a unique technique in the sense that the encrypted message can be decrypted directly by the Human Visual System (HVS). The distinguishing characteristic of VC is the ability of secret restoration without the use of computation. However because of restrictions of the HVS, pixel expansion and alignment problems, a VC scheme perhaps can only be applied to share a small size of secret image. In this paper, we propose a general method to let the VC shares carry more secrets, the technique is to use cypher output of private-key systems as the input random numbers of VC scheme, meanwhile the encryption key could be shared, the shared keys could be associated with the VC shares. After this operation, VC scheme and secret sharing scheme are merged with the private-key system. Under this design, we implement a (k,t,n)-VC scheme. Compared to those existing schemes, our approach could greatly enhance the ability of current VC schemes and could cope with pretty rich secrets. © 2013 Springer-Verlag.

关键词： Binary images

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A Model of Three Points for Location Estimation in Wireless Sensor networks

A Model of Three Points for Location Estimation in Wireless ...

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2013 2nd International Symposium on Materials Science and Engineering technology(ISMSET 2013)

作者： Shaoguo Xie Yanjun Hu Yi Wang Fang Jiang Jingjing Liu Yingguan Wang Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education An Hui University Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

In this paper, we propose a novel model of three points named TP for location estimation in wireless sensor networks(WSNs) with random deployment of anchor nodes. In this model, we select three anchor nodes which have the strongest received signal strength(RSS) for location estimation, the centroid algorithm and the method of intersection of judgment are used to estimate the location of unknown nodes. To further exploit three nearest intersection points in TP, the enhanced TP(ETP) is proposed. The simulation results show that the proposed models outperform MMSE and BML in terms of the localization accuracy for WSNs. Moreover, the localization accuracy of the proposed models in scenario 2 with random deployment of anchor nodes are better than in scenario 1 with planned deployment of anchor nodes. Additionally, compared with MMSE and BML, ETP and TP can reduce the environmental impact on location estimation.

关键词： Location estimation Anchor node Wireless sensor networks

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A regression test case generation method guided with branch probability

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and technology) 2013年第SUPPL.2期44卷 317-322页

作者： Yu, Lechen Wang, Haijun Zheng, Qinghua Liu, Ting Huang, Xiaolong Yang, Zijiang Wei, Wei MOE Key Laboratory for Intelligent Networks and Network Security Xi'an Jiaotong University Xi'an 710049 China Department of Computer Science and Technology Xi'an Jiaotong University Xi'an 710049 China School of Computer Science and Engineering Xi'an University of Technology Xi'an 710049 China

A novel method was proposed to generate regression test cases guided by the branch possibility (GBP). The symbolic execution was applied to search the paths of the program and generate control dependence graph of the program. The branch possibility was proposed to measure the possibility of that the new test case can cover the target code, which is generated by reserving the branch. The branch possibility of each branch in the test case was calculated to find the highest one which will be reserved to generate a new case, until the target code was run in the test case. 20 versions of two programs were selected to compare our method with two existing algorithms such as eXpress and dynamic symbolic execution. The results show that the GBP can generate the test case effectively, and the search time is 45.6% and 61.1% lower than that of eXpress and dynamic symbolic execution (DSE).

关键词： Regression analysis

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A heterogeneous-aware cooperative MIMO transmission scheme in WSN

Journal of Software

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Journal of Software 2013年第3期8卷 639-644页

作者： Pei, Tingrui Xie, Da Li, Zhetao Tu, Dengbiao Choi, Youngjune College of Information Engineering Xiangtan University Xiangtan 411105 China Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education Xiangtan University Xiangtan 411105 China School of Computer National University of Defense Technology Changsha 410073 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China Department of Information and Computer Engineering Ajou University Suwon 443749 Korea Republic of

A heterogeneous-aware cooperative MIMO transmission scheme (HAMS) is proposed to optimize the network lifetime and save energy for energy heterogeneous wireless sensor networks (WSN). This scheme extends the traditional low-energy adaptive clustering hierarchy (LEACH) protocol to enable the cooperative MIMO transmission between the sink and clusters. Through the adaptive selection of cooperative nodes and the cooperative MIMO transmission, HAMS can gain effective performance improvement in terms of taking advantage of the presence of node heterogeneity. Based on the energy consumption model developed in this paper, the optimal parameter to minimize the overall energy consumption is found. Simulation results exhibit that HAMS can effectively save energy and prolong the network time. Furthermore, HAMS displays more resilient in different degree of heterogeneous wireless sensor networks. © 2013 ACADEMY PUBLISHER.

关键词： Energy utilization

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An in-depth measurement and analysis of popular private tracker systems in China

An in-depth measurement and analysis of popular private trac...

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IEEE International Conference on Communications (ICC)

作者： Qiang Li Tao Qin Xiaohong Guan Qinghua Zheng Qiuzhen Huang Department of Automation Tsinghua National Laboratory for Information Science and Technology Beijing China Ministry of Education Key Laboratory for Intelligent Networks and Network Security Xi'an Jiaotong University Xi'an China

In recent years, a novel BitTorrent (BT) technology, Private Tracker (PT), has received extensive attentions in academia. Due to its huge amount of traffic volumes and population, it is essential to understand the characteristics for system management. In this paper, by using the data crawled from a number of well-known PT sites in China, we present an in-depth measurement and analysis on the PT system, in terms of resources characteristics and user behavior characteristics. Our analysis on the activity and age distribution of torrents reveals that the sequence of torrent activities follows a power-law distribution and the sequence of torrent ages follows a linear distribution. By investigating the characteristics of the core users and the resources in different PT sites, two observations have been made. Firstly, every PT site has a number of users with stable levels who contribute to the survivability and popularity of the site. Secondly, a large amount of redundancy exists among the distributed resources and many popular resources are duplicated among these sites, which leads to the quick spread of pirate resources. Based on the measurement results, we analyze the drawbacks of PT mechanisms and propose useful suggestions to promote the healthy development and performance of PT.

关键词： Redundancy Communities Educational institutions Peer-to-peer computing Time measurement Videos Motion pictures

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Software survivability evaluation method based on software calling structure

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and technology) 2013年第SUPPL.1期44卷 443-448页

作者： Hou, Yuqiao Qu, Yu Liu, Linfeng Zheng, Qinghua Liu, Ting Zheng, Chao Yang, Zijiang Key Laboratory for Intelligent Networks and Network Security Ministry of Education Xi'an Jiaotong University Xi'an 710049 China Department of Computer Science and Technology Xi'an Jiaotong University Xi'an 710049 China School of Computer Science and Engineering Xi'an University of Technology Xi'an 710048 China

A new method was proposed to evaluate the survivability of the software system based on the calling structure of the software. Firstly, the interactions among the components of the software were obtained using the static lexical analysis technology and dynamic monitoring of the AOP (Aspect ORIENTED PROGRAmming). The calling network was constructed to model the calling structure of the software. Secondly, a component failure simulation method was proposed by removing the nodes and edges corresponding to the selected components from the calling network. The residual calling network was considered as the software calling structure when the components are disabled. Then, the survivability coefficient was presented to measure the survivability of the software system, the proportion of the biggest connected subgraph of the residual network compared to the original call network diagram. In the experiments, nine open source software projects were selected to compare their survivability, and 20 versions of Struts (J2EE framework) were chosen to investigate the changes of the software survivability during their updating. Our evaluation concurs with the intuition that minor upgrades, aimed at fixing bugs and adding minor functionality quickly, reduce software survivability, whereas major upgrades, which normally clean up messy code and re-construct the software, improve software quality.

关键词： Open source software

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Compressed sensing based on best wavelet packet basis for image processing

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Journal of Computers (Finland) 2013年第8期8卷 1947-1950页

作者： Li, Zhe Tao Xie, Jing Xiong Yu, Zu Guo Tu, Deng Biao Choi, Young June The College of Information Engineering Xiangtan University Hunan 411105 China School of Computer National University of Defense Technology Hunan 410073 China Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education Xiangtan University Hunan 411105 China School of Mathematics and Computational Science Xiangtan University Hunan 411105 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China Department of Information and Computer Engineering Ajou University Suwon 443749 Korea Republic of

In this paper, an algorithm named best wavelet packet tree decomposition (BWPTD) is proposed for image compression. In order to obtain better sparse representation of image, best wavelet packet basis is introduced to decompose image signal in the algorithm. Experimental results show that BWPTD is better than single layer wavelet decompression (SLWD) and original compressed sensing (OCS) in peak signal to noise ratio (PSNR) by 2db and 8db, respectively. In addition, the reconstruction time of BWPTD is only half as that of SLWD and OCS. © 2013 ACADEMY PUBLISHER.

关键词： Compressed sensing

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Performance Comparison on network-Wide Time Synchronization Approaches in Wireless Sensor networks

Performance Comparison on Network-Wide Time Synchronization ...

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2013 IEEE International Conference on Microwave technology & Computational Electromagnetics

作者： Rong Fan Wenlong Xu LiLi Wu Li Han School of Information and Electronics Beijing Institute of Technology Shaanxi Key Laboratory of Network and System Security Xidian university

ISBN: (纸本)9781467363266

Wireless sensor networks(WSNs) have received a lot of attention recently due to their enormous potential in different *** in all distributed systems,time synchronization is very important in a sensor network since the design of many protocols and implementation of applications require precise *** this article,we first gave some basic background knowledge about time *** we introduced several typical network-wide time synchronization *** last,we compared their performances according to the some previous simulation results.

关键词： network-wide synchronization protocols,Performance comparison,Time synchronization,WSNs.

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A Generic Construction of Proxy Signatures from Certificateless Signatures

A Generic Construction of Proxy Signatures from Certificatel...

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International Conference on Advanced Information networking and Applications (AINA)

作者： Lei Zhang Qianhong Wu Bo Qin Josep Domingo-Ferrer Peng Zeng Jianwei Liu Ruiying Du Shanghai Key Laboratory of Trustworthy Computing Software Engineering Institute East China Normal University Shanghai China UNESCO Chair in Data Privacy Department of Computer Engineering and Mathematics Universitat Rovira i Virgili Tarragona Spain Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education School of Computer Wuhan University China Department of Maths School of Science Xi'an University of Technology China School of Electronic and Information Engineering Beijing University of Aeronautics and Astronautics China

The primitive of proxy signatures allows the original signer to delegate proxy signers to sign on messages on behalf of the original signer. It has found numerous applications in distributed computing scenarios where delegation of signing rights is common. Certificate less public key cryptography eliminates the complicated certificates in traditional public key cryptosystems without suffering from the key escrow problem in identity-based public key cryptography. In this paper, we reveal the relationship between the two important primitives of proxy signatures and certificate less signatures and present a generic conversion from the latter to the former. Following the generic transformation, we propose an efficient proxy signature scheme with a recent certificate less signature scheme.

关键词： Artificial intelligence Bismuth Games Public key cryptography Educational institutions

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Temperature Uniformity of Wafer on a Large-Sized Susceptor for a Nitride Vertical MOCVD Reactor

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Chinese Physics Letters 2012年第3期29卷 52-55页

作者： LI Zhi-Ming JIANG Hai-Ying HAN Yan-Bin LI Jin-Ping YIN Jian-Qin ZHANG Jin-Cheng Shandong Provincial Key Laboratory of Network-Based Intelligent Computing School of Information Science and EngineeringUniversity of Ji’nanJi’nan 250022 Key Laboratory of Fundamental Science for National on Wide Band-Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’an 710071

The effect of coil location on wafer temperature is analyzed in a vertical MOCVD reactor by induction *** is observed that the temperature distribution in the wafer with the coils under the graphite susceptor is more uniform than that with the coils around the outside wall of the *** the case of coils under the susceptor,we find that the thickness of the susceptor,the distance from the coils to the susceptor bottom and the coil turns significantly affect the temperature uniformity of the *** optimization process is executed for a 3-inch susceptor with this kind of structure,resulting in a large improvement in the temperature uniformity.A further optimization demonstrates that the new susceptor structure is also suitable for either multiple wafers or large-sized wafers approaching 6 and 8 inches.

关键词： MOCVD optimization Vertical

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