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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Fan Zhang Wei Wang Zhaoyang Zhang Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong China Department of Information Science and Electronic Engineering Zhejiang Provincial Key Laboratory of Information Network Technology University of Zhejiang Hangzhou China Key Laboratory of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781457713460

Spectrum sensing is adopted to detect the presence of primary users in cognitive radio networks. Considering the sensing overhead, it is not always a good choice that the secondary user senses the channel all the time. In this paper, we propose an opportunistic spectrum sensing decision method according to the primary user's traffic. First, the traffic of primary user is observed and estimated. For estimating the parameters of the primary traffic, the Maximum Likelihood estimation is adopted and the confidence interval is calculated based on finite observed samples. Then, according to the estimated primary traffic information, a decision criterion is proposed for determining whether to sense the channel. The simulation results show that the performance of the proposed opportunistic sensing scheme is much better than that when sensing at every timeslots and very close to that in the ideal case in which the primary traffic information is obtained perfectly.

关键词： Sensors Maximum likelihood estimation Channel estimation Cognitive radio Wireless sensor networks Educational institutions Parameter estimation

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eHCBAC: Flexible Column Based Access Control for Electronic Healthcare Systems

eHCBAC: Flexible Column Based Access Control for Electronic ...

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IEEE International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom)

作者： Mei Liu Ge Fu Jiwu Jing State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences China National Computer Network Emergency Response Technical Team Coordination Center of China China

An electronic healthcare (e-Health) system is a database system that collects patients' medical data from participating organizations such as hospitals, clinics and insurance companies, and facilitates services for these organizations. Though e-Health system transforms healthcare services with great savings in terms of efficiency and cost, it also triggers great privacy concerns as all patients' data are maintained in a centralized system which may be accessed and misused by unauthorized parties. One of the most important features of an e-Health system is that the sensitive data mainly distribute in certain columns. Thus, we propose a column based access control scheme for an e-Health database system (eHCBAC scheme), which protects the data by means of imposing access control policies on sensitive columns. Furthermore, we design algorithms to achieve eHCBAC for different SQL statements, and implement an prototype system by adding column based access control module into an open-source DBMS kernel. Experimental results demonstrate the effectiveness and efficiency of the prototype system.

关键词： Access control computer aided software engineering Diseases Database systems Prototypes

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RETRACTED ARTICLE: An approach to evaluate the effects of virtual topology on in-band crosstalk attack propagation in transparent optical networks

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Photonic network Communications 2012年第2期24卷 166-166页

作者： Xiao, Yonghua Peng, Yunfeng Sun, Zeyu Zhao, Changming Long, Keping Key Laboratory of Optical Fiber Sensing and Communications Education Ministry of China University of Electronic Science and Technology of China Chengdu China Institute of Advanced Network Technology and New Services (ANTS) School of Computer and Communication Engineering (CCE) University of Science and Technology Beijing (USTB) Beijing China College of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing China

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Threshold-based message copies control in delay tolerant networks

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Journal of networks 2011年第1期6卷 96-103页

作者： Yu, Haizheng Bian, Hong College of Mathematics and System Sciences Xinjiang University Urumqi China Key Laboratory of Computer Network and Information Security Xidian University Xi'an China School of Mathematical Sciences Xinjiang Normal University Urumqi Xinjiang China

Delay Tolerant networks (DTN) generally lack end-to-end connectivity and multiple message copies routing protocols are often used to improve the efficiency that messages are delivered successfully, but network load is increased due to a large number of message copies. A new scheme based on threshold is presented to control message copies efficiently in the networks. A contact counter is added in every node for Epidemic routing scheme and the counter of every node records the number of nodes, which it contacts, with the same copy for a message. If the counter value of a node reaches the threshold which was set, then the node drops message copy. We analysis threshold in theory and derive the lower bound of threshold in delay tolerant networks. According to the lower bound of threshold, we can set a proper threshold in the networks. Using the new scheme message copies reduce obviously and are dropped completely in the end. The successful delivery ratio is no less than Epidemic routing and message copies are controlled efficiently. We show that it is validity in our scheme by comparing with the trends of message copies among different thresholds in two mobility scenes. © 2011 ACADEMY PUBLISHER.

关键词： Delay tolerant networks

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Research of routing techniques on delay tolerant networks

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Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology 2011年第SUPPL. 1期35卷 215-222页

作者： Xu, Jia Wang, Ru-Chuan Sun, Li-Juan Xiao, Fu Computer Institute Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Laboratory for Computer Network and Information Integration of Ministry of Education Southeast University Nanjing 211189 China State Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China

Delay tolerant networks(DTNs) can interconnect highly heterogeneous networks among extreme environments even between nodes without end-to-end path. As a new evolution of Mobile Ad hoc network(MANET)and wireless sensor network(WSN), the DTN is an important technique in ubiquitous networking when the time-space range of data collection and service is greatly expanded. As the key components of DTN, routing technique is a challenge and promising research field. While a lot of DTN routing protocols have been proposed, there is no comprehensive classification system for DTN routing protocols. Review for various protocols in respect of principles, characteristics, comparisons is also needed. This paper introduces the architecture, challenges, theoretical basis, evaluation metrics and classification of DTN routing protocols. The basic principles and features of representative routing algorithms are analyzed and compared for each class, intending to motivate new research and development in this area.

关键词： Delay tolerant networks

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Runtime-Based Boot Components Re-measurement Scheme for Trusted Platform

Runtime-Based Boot Components Re-measurement Scheme for Trus...

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2011 International Conference on Informatics,Cybernetics,and computer Engineering(ICCE 2011)

作者： Peng Weiping Zhou Yajian Wang Cong Yang Yixian Key Laboratory of Network and Information Attack & Defence Technology of MOE Beijing University of Posts and Telecommunications School of Computer Science and Technology Henan Polytechnic University Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications

Integrity measurement is just one of the most important features in a trusted computing platform to provide evidence of platform configuration and behavior. Each set of software instructions(binary code) is measured and recorded before it is executed. Especially, all of boot components which be recorded in pre-boot stage can't be re-measured until the platform is rebooted. However, the reality is that many components belong to pre-boot stage, such as BIOS, Boot Loader and MBR, are easily modified or updated in runtime environment. If these updated results of components are treated as configuration requirements for a remote server-side to verify the access request, the remote network access connection will fail. It must restart the host to re-measure there components, and the result of the new measure is not guaranteed right absolutely. We solve this problem by embedding Integrity Measurement Agency Component(IMAC) which has the capability of monitoring transformation, verifying credibility, updating Platform Configuration Registers and recording integrity measurement logs in Linux kernel. The result of performance analysis demonstrates that the method is feasible and credible.

关键词： Trusted Computing Boot Components PCR Integrity measurement Agency Component

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An anonymity and authentication mechanism for internet of things

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Journal of Convergence information Technology 2011年第3期6卷 98-105页

作者： Wang, Xiaoliang Sun, Xingming Yang, Hengfu Shah, Saeed Arif College of Information Engineering Xiangtan University Xiangtan 411105 China Department of Computer Science and Technology Nanjing University of Information Science and Technology Nanjin 210044 China Department of Information Science and Engineering Hunan First Normal University Changsha 410205 China Hunan Provincial Key Laboratory of Network and Information Security Hunan University Changsha 410082 China

Authentication has received increasing attention in the literatures of Internet of Things. At the same time, numerous concerns have been raised about the issue of anonymity due to users' awareness of their privacy nowadays. How to achieve trade-off between anonymity and certification simultaneously? In this paper, we propose a security architecture to ensure anonymity and certification for Internet of Things. We use pseudonym and threshold secret sharing approach to resolve conflict between anonymity and certification. Moreover, the implementation of Bloom filter offers security authentication for remote command. Security analysis shows that the proposed mechanism can perfectly achieve tradeoff between anonymity, certification, and also resist impersonation, tamper as well as compromise attacks.

关键词： Internet of things

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SWP2P: P2P anonymous trace system based on superposition watermarking

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content Technology and its Applications 2011年第8期5卷 116-126页

A lot of attention has been paid to anonymity due to the users' privacy protection. While peer-topeer (P2P) networks need anonymity capacity, the authority also requires partner traceability to prevent anonymous abuse. So there is a challenge to harmonize the dilemma between the anonymity and authentication in P2P networks. Few P2P protocol provides complete anonymity as well as traceability. In this paper, we propose a security mechanism to ensure anonymity for honest peers and traceability for misbehaving peers in P2P systems. We utilize superposition watermarking based anonymity trace scheme to resolve the conflicts between traceability and anonymity. This scheme uses information processing technology similar to CDMA to superpose path information. Security analysis and simulation result show that the superposition watermarking based P2P anonymity trace scheme (SWP2P) can attain tradeoff between anonymity and traceability perfectly.

关键词： Watermarking

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Genetic Algorithm-Based Power Management in Cloud Platform

Genetic Algorithm-Based Power Management in Cloud Platform

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International Conference on Internet Technology and Applications (iTAP)

作者： Zili Xiong Zhang Zhang Huafeng Kong Deqing Zou School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Key Laboratory of Information Network Security Ministry of Public Security Third Research Institute of Ministry of Public Security Shanghai China

Cloud computing is a novel computing pattern, and it can provide underlying hardware resource for cloud users on demand. Virtualization is the key technology of cloud computing, and it provides the technical support for cloud computing. In cloud platform, power management is an indispensable function of cloud system administration. Based on genetic algorithm, this paper proposes a power management method based on virtual cluster. The experiments on Xen platform prove the effectiveness of our method.

关键词： Genetic algorithms Entropy Cloud computing Quality of service Security Presses Clustering algorithms

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Conflict-Free Transmission Schedule Based on network Coding in Wireless networks

Conflict-Free Transmission Schedule Based on Network Coding ...

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WRI International Conference on Communications and Mobile Computing, CMC

作者： Jing Wang Xiangyang Liu Xinmei Wang School of Information Engineering Chang'an University Xi'an China Computer Network Teaching Office Xian Communications College Xi'an China State Key Laboratory of Integrated Service Networks Xidian University Xi'an China

In wireless networks, the cross-layer design of joint medium access control and network coding can avoid destructive interferences among concurrent transmissions. Wireless network codes in conjunction with conflict-free network realizations are designed by Sagduyu. Then, this paper proposed a new conflict-free transmission schedule based on network coding to achieve better network performance. We construct sub tree graphs by sub tree decomposition, and based on the achieved sub tree graphs, time slots are assigned from the first sub tree. Nodes of the latter sub trees can be chosen to combine with the front time slots according to whether there exist conflicts or not. Finally, network codes allocation method for network with two sources is presented, which adopts the theory of graph coloring.

关键词： network coding Wireless networks Encoding Color Resource management Schedules Algorithm design and analysis

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