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arXiv 2017年

作者： Cong, Runmin Lei, Jianjun Fu, Huazhu Lin, Weisi Huang, Qingming Cao, Xiaochun Hou, Chunping School of Electrical and Information Engineering Tianjin University Tianjin300072 China School of Computer Engineering Nanyang Technological University Singapore639798 Singapore Institute for Infocomm Research Ocular Imaging Department Agency for Science Technology and Research Singapore138632 Singapore School of Computer and Control Engineering University of Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China University of Chinese Academy of Sciences

As a newly emerging and significant topic in computer vision community, co-saliency detection aims at discovering the common salient objects in multiple related images. The existing methods often generate the co-saliency map through a direct forward pipeline which is based on the designed cues or initialization, but lack the refinement-cycle scheme. Moreover, they mainly focus on RGB image and ignore the depth information for RGBD images. In this paper, we propose an iterative RGBD co-saliency framework, which utilizes the existing single saliency maps as the initialization, and generates the final RGBD cosaliency map by using a refinement-cycle model. Three schemes are employed in the proposed RGBD co-saliency framework, which include the addition scheme, deletion scheme, and iteration scheme. The addition scheme is used to highlight the salient regions based on intra-image depth propagation and saliency propagation, while the deletion scheme filters the saliency regions and removes the non-common salient regions based on interimage constraint. The iteration scheme is proposed to obtain more homogeneous and consistent co-saliency map. Furthermore, a novel descriptor, named depth shape prior, is proposed in the addition scheme to introduce the depth information to enhance identification of co-salient objects. The proposed method can effectively exploit any existing 2D saliency model to work well in RGBD co-saliency scenarios. The experiments on two RGBD cosaliency datasets demonstrate the effectiveness of our proposed framework. Copyright © 2017, The Authors. All rights reserved.

关键词： Iterative methods

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A Stackelberg Game for DSTC-Based Cognitive Radio Networks with Multiple Cooperative Relays

A Stackelberg Game for DSTC-Based Cognitive Radio Networks w...

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International Conference on Intelligent Networking and Collaborative Systems (INCOS)

作者： Lijie Wang Yi Tang Bo Yuan Dangfeng Zhu Xi'an Satellite Control Center Xi'an China National Key Laboratory of Science and Technology Information System Security Beijing China

The spectrum utility can be improved when cooperative communication technology is incorporated into cognitive radio network, and both the licensed users and secondary users can benefit from cooperating. In this cooperative cognitive radio network, a primary user and multiple secondary users cooperate with each other adopting space-time coding relay scheme to benefit win-win cooperation. Considering the primary user owns the spectrum and both the primary user and secondary users are selfish and reasonable, this cooperative cognitive network is formulated as a Stackelberg game. Based on utility maximizing, this paper studies the spectrum allocation and relay selection problem. A spectrum allocation algorithm is derived under given number of secondary users, and a low complexity relay selection strategy is proposed to maximize the utility of the primary user while guaranteeing the data rate of the primary user and the fairness among the secondary users. Numerical results show the feasibility and validity of the proposed relay selection scheme.

关键词： Relays Transmitters Cognitive radio Encoding Resource management Computational modeling Games

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Agile laser beam deflection with high steering precision and angular resolution using liquid crystal optical phased array

Agile laser beam deflection with high steering precision and...

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IEEE International Nanoelectronics Conference (INEC)

作者： Xiangru Wang Shuanghong Wu Man Li School of Optoelectronic Information University of Electronic Science and Tech. of China Chengdu China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe China

To improve the steering precision and angular resolution of liquid crystal optical phased array, in this paper, we proposed a modified periodic phase controlled method to realize a continuous scanning with a constant angular resolution of less than 20 μrad, meanwhile, its precision is less than 5 μrad (RMS). Also, another method we proposed is called sub-aperture coherence can realize even better angular resolution less than 5 μrad which is the limitation of our measurement instrument.

关键词： Measurement by laser beam Laser beams Phased arrays Optical arrays Coherence Laser theory Laser radar

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A new important-place identification method

A new important-place identification method

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IEEE International Conference on Computer and communications, ICCC 2015

作者： Ma, Chun-Lai Ma, Tao Shan, Hong Electronic Engineering Institute Hefei China Science and Technology on Communication Information Security Control Laboratory Hefei China

ISBN: (纸本)9781467381253

For the problem that the location of LBSN users was sparse because of it was updated sporadically. An important place identification method was studied by improving the clustering algorithm. Firstly, a velocity pruning algorithm was applied to remove interference points from source data. Secondly, clustering algorithm based on density peak named CFSFDP was selected. To solve the problem that it is unable to decide the cluster number with CFSFDP, an improved algorithm was presented. With a cluster center automatic choosing strategy, the algorithm searched for the 'turning points' with the trends of cluster center weights changing. Then we could regard a set of points which weight is bigger than turning points' as cluster center. As a result, the error brought by ruling in the Decision Graph could be avoided with the strategy. Thirdly, reverse geocoding technology was applied to translate coordinate in semantic place. Check-in data of Foursquare user was set as an example in experiment, the result show that the improved algorithm had higher accuracy rate and lower computation compared to CFSFDP and DBSCAN. It also proved that the feasibility and effectiveness of the method proposed in the paper. © 2015 IEEE.

关键词： Clustering algorithms

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GB-RC4: Effective brute force attacks on RC4 algorithm using GPU 7

GB-RC4: Effective brute force attacks on RC4 algorithm using...

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7th International Green and Sustainable Computing Conference, IGSC 2016

作者： Xue, Pei Li, Tao Dong, Han Liu, Chunbo Ma, Wenjing Pei, Songwen College of Computer and Control Engineering Nankai University Tianjin300071 China Information Security Evaluation Center Civil Aviation University of China Tianjin300300 China Laboratory of Parallel Software and Computational Science State Key Laboratory of Computing Science Institute of Software CAS Beijing China Shanghai Key Lab of Modern Optical Systems Department of Computer Science and Engineering University of Shanghai for Science and Technology Shanghai200093 China

ISBN: (纸本)9781509051175

Encryption algorithms are applied to a variety of fields and the security of encryption algorithms depends heavily on the computational infeasibility of exhaustive key-space search. RC4 algorithm has an extensive application for stream encryption, however, the disadvantages of traditional RC4 serial algorithm are large computational quantity and slow computation speed, which means a great challenge for throughput of computing system. Graphics processors recently have been widely used as accelerators for high throughput computing. In this paper, GPU is used to improve the efficiency and performance of attacking RC4 algorithm. First, we revised RC4 algorithm to make it easier to parallelize on a GPU. Then we take advantage of constant memory and shared memory in GPU to search the key space of RC4 algorithm efficiently. Besides, we solved the bank conflict problem in shared memory to further improve the performance. Our approach was evaluated in the whole key space of 40-bit, and the results show it can complete searching of the whole key space within 12.8 hours. © 2016 IEEE.

关键词： Graphics processing unit

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Cloud Platform Based Automated security Testing System for Mobile Internet

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Tsinghua science and technology 2015年第6期20卷 537-544页

作者： Dan Tao Zhaowen Lin Cheng Lu the School of Electronic and Information Engineering Beijing Jiaotong University Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Network and Information Center Institute of Network TechnologyScience and Technology on Information Transmission and Dissemination in Communication Networks LaboratoryNational Engineering Laboratory for Mobile Network SecurityBeijing University of Posts and Telecommunications

With respect to security, the use of various terminals in the mobile Internet environment is *** terminal testing methods cannot simulate actual testing environments; thus, the test results do not accurately reflect the security of terminals. To address this problem, we designed and developed a cloud platform based automated testing system for the mobile Internet. In this system, virtualization and automation technology are utilized to integrate mobile terminals into the cloud platform as a resource, to achieve a novel cloud service called Testing as a Service(Taa S). The system consists of three functional modules: web front-end module, testing environment module, and automated testing module. We adopted the permeable automated testing tool Metasploit to perform security testing. In our test experiments, we selected 100 apps with diverse vulnerability levels, ranging from secure to vulnerable, to perform a series of functional tests. The experimental results show that this system can correctly test both the number of vulnerable apps and their corresponding vulnerability levels. As such, the designed system can flexibly configure various testing environments for different testing cases or projects, and thereby perform security testing automatically.

关键词： automated security testing cloud platform virtuali

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A hybrid biometric identification framework for high security applications

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Frontiers of Computer science 2015年第3期9卷 392-401页

作者： Xuzhou LI Yilong YIN Yanbin NING Gongping YANG Lei PAN School of Computer Science and Technology Shandong University Jinan 250101 China Key Laboratory of Information Security and Intelligent Control of Shandong Province Shandong Youth University of Political Science Jinan 250103 China

Research on biometrics for high security applica- tions has not attracted as much attention as civilian or foren- sic applications. Limited research and deficient analysis so far has led to a lack of general solutions and leaves this as a challenging issue. This work provides a systematic analy- sis and identification of the problems to be solved in order to meet the performance requirements for high security applica- tions, a double low problem. A hybrid ensemble framework is proposed to solve this problem. Setting an adequately high threshold for each matcher can guarantee a zero false accep- tance rate （FAR） and then use the hybrid ensemble framework makes the false reject rate （FRR） as low as possible. Three ex- periments are performed to verify the effectiveness and gener- alization of the framework. First, two fingerprint verification algorithms are fused. In this test only 10.55% of fingerprints are falsely rejected with zero false acceptance rate, this is sig- nificantly lower than other state of the art methods. Second, in face verification, the framework also results in a large re- duction in incorrect classification. Finally, assessing the per- formance of the framework on a combination of face and gait verification using a heterogeneous database show this frame- work can achieve both 0% false rejection and 0% false accep- tance simultaneously.

关键词： biometric verification hybrid ensemble frame-work high security applications

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Handedness Recognition through Keystroke-Typing Behavior in Computer Forensics Analysis

Handedness Recognition through Keystroke-Typing Behavior in ...

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IEEE International Conference on Trust, security and Privacy in Computing and communications (TrustCom)

作者： Chao Shen Haodi Xu Haijun Wang Xiaohong Guan Science and Technology on Electronic Information Control Laboratory Chengdu China MOE Key Lab for Intelligent Networks and Network Security Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781509032068

Recognizing computer users' handedness provides important clues for profiling computer criminals in digital forensic analysis. Existing technologies for handedness recognition have two main problems that limit their applicability in the scenario of digital crimes: they can be intrusive, and they require costly equipment. Our solution is to infer users' handedness by analyzing keystroke-typing behavior. Field studies are first conducted to gather users' keystroke-typing data during their interaction with computers. Timing features are extracted to characterize users' typing rhythms, and the correlation between keystroke features and handedness is analyzed. Classification techniques are then developed for handedness recognition. Experimental results show that the handedness could be efficiently and accurately inferred from users' keystroke-typing behavior, with recognition rates expressed by the Area Under the ROC Curve (AUC) of 87.75%. To our knowledge, this is the first work that infers users' handedness based on their keystroke-typing biometric during interaction with computers, without dedicated and explicit actions that require attention from users.

关键词： Computers Feature extraction Forensics Speech recognition Fingerprint recognition Timing Bioinformatics

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Comment on “Quantum oblivious set-member decision protocol”

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Physical Review A 2016年第3期93卷 036301-036301页

作者： Bin Liu Di Xiao Wei Huang Ting-Ting Song Key Laboratory of Dependable Service Computing in Cyber Physical Society (Chongqing University) of Ministry of Education College of Computer Science Chongqing University Chongqing 400044 China Science and Technology on Communication Security Laboratory Chengdu 610041 China Department of Computer Science College of Information Science and Technology Jinan University Guangzhou 510632 China

In a recent paper [Phys. Rev. A 92, 022309 (2015)], the authors proposed a quantum oblivious set-member decision protocol, which is designed to allow a server to check whether a private secret of a user is a member of his private set in an oblivious manner. Such protocols should protect the privacies of both the server and the user. However, we find that the user in their protocol can steal l−1 bits of information about the server's private set by sending the false decoy states.

关键词： Quantum cryptography

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Network node importance measurement method based on vulnerability analysis 4th

Network node importance measurement method based on vulnerab...

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4th International Conference on Computer Engineering and Networks, CENet2014

作者： Li, Yahui Yang, Hongwa Xie, Kai Science and Technology on Communication Information Security Control Laboratory Jiaxing314000 China Northern Electronic Instrument Institute Beijing100191 China

ISBN: (纸本)9783319111032

As to select the important nodes from network, the key problems are to determine the basis and quantitative standard of evaluating node importance. This chapter proposes the measurement method of network node importance from the aspect of vulnerability, including topological structure vulnerability evaluation standard based on degree distribution, betweenness centrality, round-robin betweenness centrality, and extension degree distribution;and application vulnerability evaluation standard based on maximum load link and information value. The experiment results show that the measure standard of network node importance based on extension degree distribution not only reflects the value of the node itself, but comprehensively considers indirect effect of node to network;it can well describe the differences among nodes in a network, and time complexity of the algorithm is smaller. © Springer International Publishing Switzerland 2015.

关键词： Topology

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