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International Journal of Digital Content Technology and its Applications 2012年第7期6卷 225-233页

作者： Xin, Li Ru, Zhang Xinxin, Niu Junfeng, Xu Information Security Center Beijing University of Posts and Telecommunications China Information Security Center Beijing University of Posts and Telecommunications Key Laboratory of Information Network Security Ministry of Public Security China National Computer network Emergency Response technical Team/Coordination Center of China China

The properties of modular inverse were analyzed and gain to improve the extended Euclid algorithm. In the new scheme, even-reduction and remainder-attenuation were proposed which insured the remainder be attenuated to one third of before in each loop at least, so that for y = a-1 mod p, the number of loops will be lower than log 3 a. Software testing shows the new algorithm is significantly improved on speed than the original algorithm.

关键词： Software testing

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Security Analysis of an Electronic Commerce Protocol Using Casper/FDR2

Security Analysis of an Electronic Commerce Protocol Using C...

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第六届中国可信计算与信息安全学术会议

作者： CHANG Yinlong HU Huaping Department of Mathematics and Computer Science/Key Laboratory of Information Security of Network Sys School of Computer Science National University of Defense TechnologyChangsha 410073HunanChina

Researchers have proposed several security protocols to protect the electronic commerce security in these years;however,not all of them are secure *** article extends model checking method with Casper/FDR2 to model and analyze a new electronic *** are found in the protocol and their mechanisms are discussed.A variety of solutions are given to different security *** improved protocol is proven to be robust and secure.

关键词： Casper FDR2 electronic commerce model checking formal analysis

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Provably secure and effcient identity-based signature scheme based on cubic residues

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International Journal of network Security 2012年第1期14卷 33-38页

作者： Wang, Zhiwei Wang, Licheng Zheng, Shihui Yang, Yixian Hu, Zhengming Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China College of Computer Nanjing University of Posts and Telecommunications China

Many identity based signature (IBS) schemes have been proposed so far. However, most of the schemes are based on bilinear pairings. Only a few IBS schemes are with-out pairings. Up to now, there still remains a challenge to construct a provably secure and effcient IBS scheme without pairings. In this paper, we propose an effcient IBS scheme based on cubic residues, and we prove that our scheme is secure against adaptively chosen message and ID attack.

关键词： Public key cryptography

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Performance analysis of vector OFDM with linear MMSE receiver

Performance analysis of vector OFDM with linear MMSE receive...

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2012 1st IEEE International Conference on Communications in China, ICCC 2012

作者： Li, Yabo Ngebani, Ibo Xia, Xiang-Gen Høst-Madsen, Anders Department of Information Science and Electrical Engineering Zhejiang Provincial Key Laboratory of Information Network Technology Zhejiang University Hangzhou Zhejiang China Department of Electrical and Computer Engineering University of Delaware Newark DE 19716 United States Department of Electrical Engineering University of Hawaii at Manoa Honolulu HI 96822 United States Chonbuk National University Jeonju Korea Republic of

ISBN: (纸本)9781467328159

Vector OFDM (V-OFDM) for single transmit antenna systems is a general transmission scheme in which OFDM and Single-Carrier Frequency Domain Equalization (SC-FDE) can be considered as two extreme/special cases. Due to its flexibility, it has attracted more and more attention recently. So far all studies about V-OFDM assume the Maximum Likelihood (ML) receiver. In this paper, we investigate the performance of V-OFDM with linear Minimum Mean Square Error (MMSE) receiver. We first show that for linear MMSE receiver, all the vector blocks (VB) in V-OFDM have equal performance, this is different from V-OFDM with ML receiver, where different VBs may have different performances. Then, we analyze the diversity order of V-OFDM with linear MMSE receiver, and show that, regardless of the V-OFDM symbol length N, the diversity order can be represented as min{[M2-R], D} + 1, where M is the VB size, /i is the spectrum efficiency in bits/symbol, and D is the maximum delay of the multipath channel. © 2012 IEEE.

关键词： Orthogonal frequency division multiplexing

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A generic approach for providing revocation support in secret handshake

A generic approach for providing revocation support in secre...

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14th International Conference on information and Communications Security, ICICS 2012

作者： Yang, Yanjiang Lu, Haibing Weng, Jian Ding, Xuhua Zhou, Jianying Institute for Infocomm Research Singapore Singapore Dept. of Operations Management and Information Systems Leavey School of Business Santa Clara University United States Department of Computer Science Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University China Shanghai Key Laboratory of Integrate Administration Technologies for Information Security Shanghai China School of Information Systems Singapore Management University Singapore Singapore

ISBN: (纸本)9783642341281

Privacy protection and user revocation are essentially conflicting requirements in many cryptographic protocols. It is a particularly challenging problem to harmonize them in a secret handshake protocol that is geared to offering strong privacy protection on the participants' group membership in the protocol execution. In this paper, we study this problem and propose a generic approach to provide revocation support in secret handshake protocols, without sacrificing the notion of privacy preserving. The main building block of our approach is CGC (Confidential Group Communication), a primitive formulated in this paper, and we present a concrete instantiation so as to realize our generic approach. © 2012 Springer-Verlag.

关键词： Data privacy

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DRTEMBB: Dynamic recommendation trust evaluation model based on bidding

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Journal of Multimedia 2012年第4期7卷 279-288页

作者： Wang, Gang Gui, Xiao-lin Department of Electronics and Information Engineering Xi'an Jiaotong University Xi'an China Shanxi Province Key Laboratory of Computer Network Xi'an Jiaotong University Xi'an China School of Information Xi'an University of Finance and Economics Xi'an China

Fraud or cheating of malicious nodes were restrained by reducing the trust value of malicious nodes in the past trust model, but few recommendation nodes for cooperation cheating are punished, so it has had only limited malicious recommendation or fraudulent action again and again. Due to lack of punishment for malicious recommendation of recommendation nodes, enormous malicious recommendation nodes remain and search for next criminal opportunity. By borrowing idea of bidding and the introduction of competition and the mechanism of rewards and penalty, this paper proposes a dynamic recommendation trust evaluated model based on bidding in E-Commerce environment. By greatly increasing the "criminal cost" of malicious recommendation nodes, with recommendation optimization algorithm based on Markov chain, the model ensures that the recommendation service is true and more objective, which will stimulate the enthusiasm of nodes objective recommendation and reach the goal that nodes give up malicious recommendation and cooperative cheating on its own initiative by objective method so as to restrain malicious recommendation and cooperative cheating effectively. In simulation experiment, the model also shows good restraint on malicious recommendation. © 2012 ACADEMY PUBLISHER.

关键词： Crime

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An new anonymous authentication scheme for cloud computing

An new anonymous authentication scheme for cloud computing

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2012 7th International Conference on computer Science and Education, ICCSE 2012

作者： Zhang, Zhi-Hua Li, Jian-Jun Jiang, Wei Zhao, Yong Gong, Bei China Tobacco Zhejiang Iidustrial Co. Ltd. Hangzhou 310009 China College of Computer Science Beijing University of Technology Beijing 100124 China Key Laboratory of Information and Network Security 3rd Research Institute Ministry of Public Security Beijing 100124 China Beijing 100124 China

ISBN: (纸本)9781467302425

Cloud computing is a hot topic of current research, for anonymous authentication is required in many applications scenarios of e-business based on cloud computing, users do not want to expose their identity, users just hope that service providers know they are legitimate users like, for this application, this paper presents a anonymous authentication scheme without certificate, which this scheme avoids the issues how to revocation public key certificate and the escrow problem of key, and then the security of the scheme is analyzed. © 2012 IEEE.

关键词： Cloud computing

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Semantic access control for cloud computing based on e-Healthcare

Semantic access control for cloud computing based on e-Healt...

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International Conference on computer Supported Cooperative Work in Design

作者： Lili Sun Hua Wang Jianming Yong Guoxin Wu Centre for Systems Biology University of Southern Queensland Toowoomba Australia School of Information Systems University of Southern Queensland Toowoomba Australia School of Computer Science and Engineering & Key Laboratory for Computer Network and Information Integration Southeast Univeristy

With the increased development of cloud computing, access control policies have become an important issue in the security filed of cloud computing. Semantic web is the extension of current Web which aims at automation, integration and reuse of data among different web applications such as clouding computing. However, Semantic web applications pose some new requirements for security mechanisms especially in the access control models. In this paper, we analyse existing access control methods and present a semantic based access control model which considers semantic relations among different entities in cloud computing environment. We have enriched the research for semantic web technology with role-based access control that is able to be applied in the field of medical information system or e-Healthcare system. This work demonstrates how the semantic web technology provides efficient solutions for the management of complex and distributed data in heterogeneous systems, and it can be used in the medical information systems as well.

关键词： Computational modeling Educational institutions Clouds Security Medical services Australia Temperature control

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Semantics-Based Compliance An a lys is o f N e two rk S e cu rity Policy Hie ra rch ie s

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China Communications 2012年第7期9卷 22-35页

作者： Yao Shan Xia Chunhe Hu Junshun Jiao Jian Li Xiaojian Beijing Key Laboratory of Network Technology Beihang University Beijing 100191 P. R. China Beijing Information Technology University Beijing 100192 P. R. China College of Computer Science and Information Technology Guangxi Normal University Guilin 541004 P. R. China

network security policy and the automated refinement of its hierarchies aims to simplify the administration of security services in complex network environments. The semantic gap between the policy hierarchies reflects the validity of the policy hierarchies yielded by the automated policy refinement process. However, little attention has been paid to the evaluation of the compliance between the derived lower level policy and the higher level policy. We present an ontology based on Ontology Web Language （OWL） to describe the semantics of security policy and their implementation. We also propose a method of estimating the semantic similarity between a given

关键词： policy refinement network security policy semantic similarity ontology

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An improved clustering algorithm based on intersecting circle structure

An improved clustering algorithm based on intersecting circl...

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International Conference on computer Supported Cooperative Work in Design

作者： Ze-Jun Yang Ying-long Wang Fu-Meng Zhao Tai-Bo Huang Shandong Province Key Network Laboratory Shandong Computer Science Center Jinan China School of Information Science & Engineering Shandong Normal University Jinan China

A good clustering algorithm can provide the basis for forming a good network topology and target location, improve routing efficiency and greatly reduce energy consumption. For the lack of GAF algorithm, an improved algorithm is putted forward. First of all, the monitored area is divided into many sections according to the intersecting circle structure. Then the nodes which meet specific criteria will be elected as cluster heads. Finally, some nodes in overlapping area of intersecting circles will be elected as the Mid Nodes to achieve multi-hops routing. As is shown in the experiment, the improved algorithm can greatly save energy consumption of nodes, and extend the lifetime of wireless sensor networks.

关键词： Mobile computing Routing Mobile communication Ad hoc networks

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