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2009 International Conference on Information Engineering and Computer Science, ICIECS 2009

作者： Bing, Liu Cheng, Song Yang, Xin Yixian, Yang Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Safe-Code Technology Co. Ltd. China

ISBN: (纸本)9781424449941

The NAC (network Access Control) technology which enforces the endpoint access decision based on the collected endpoint security status information and platform measurement information has been developed by various companies and has been widely deployed in intranets. Besides intranet, mobile telecommunication networks also find NAC is required. This paper introduces the main NAC solutions in industry and analyzes the essential of current NAC technologies in the perspective of protocol. And then this paper describes the explicit requirement of remote platform integrity validation which may utilize the NAC in the mobile telecommunication networks and discus a feasible way of implementing the NAC technology into a scenario by using protocol adaption of EAP over IKEv2. ©2009 IEEE.

关键词： Intranets

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On the implementation of prototype system for wireless network's trusted access architecture

On the implementation of prototype system for wireless netwo...

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2009 IEEE International Conference on Communications technology and Applications, IEEE ICCTA2009

作者： Jun, Cui Zhentao, Zhang Yixian, Yang Peng, Gao Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing China China Mobile Group Design Institute Co. Ltd. Beijing China

ISBN: (纸本)9781424448203

In the telecommunication operator wireless network, the user is identifiable and centrally managed, therefore the user trust can also be centrally managed. In this paper, we propose trust cloud model based on cloud model to solve the user trust management problems in the operator wireless networks, including the trust collection, storage, evaluation and update. In the trust cloud model, we realizes the conversion between the qualitative concept and quantitative value of trust based on the satisfaction degree, the trust timeliness based on the trust vector buffer queue, the trust evaluation and update based on the backward cloud algorithm of cloud model, and determine the user trust tendency based on the numerical characteristics of cloud model. The trust cloud model proposed by this paper is easy to implement, on the analysis of the general need of the user trust management in operator wireless network, the implementation of prototype system for wireless network's trusted access architecture has realized. This prototype system uses the standard protocol to communicate with the wireless network environment, and the trust service newly added in this prototype system has little influence on the original wireless network, so this prototype system has certain practical application value. ©2009 IEEE.

关键词： Wireless networks

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SkyF2F: Censorship Resistant via Skype Overlay network

SkyF2F: Censorship Resistant via Skype Overlay Network

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WASE International Conference on Information Engineering, ICIE

作者： Shoufeng Cao Longtao He Zhongxian Li Yixian Yang Information Security Center State Key Laboratory of Networking and Switching Technology Key Laboratory of network and information attack & defence technology of MOE Beijing University of Posts and Telecommunications China Research Center of Information Security Institute of Computing Technology Chinese Academy and Sciences Beijing China

Internet censorship is on the rise as an increasing number of countries and companies block or monitor access to parts of the Internet. Many censorship resistant systems have been proposed, which rely on deploying many access points to the censored domain. Therefore they face the problem of discovering available nodes and deploying a large number of nodes. Opposite to many access point approach, we present a system building on existing overlay network, a low-cost solution for circumventing Internet, called SkyF2F. SkyF2F is a plug-in for Skype client that allows users to establish a covert communication tunnel across Skype overlay network. We describe the design, a prototype implementation and security analysis of SkyF2F. Our security analysis shows that SkyF2F can successfully circumvent several sophisticated censoring techniques.

关键词： Information security Internet Computer security National security Laboratories Cryptography Buildings Prototypes Monitoring IP networks

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A strong designated verifier ring signcryption scheme

A strong designated verifier ring signcryption scheme

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5th International Conference on Wireless Communications, networking and Mobile computing, WiCOM 2009

作者： Shengju, Han Huaqun, Wang Xiukun, Wang School of Electronic and Information Engineering Dalian University of Technology Dalian China School of Information Engineering Dalian Fisheries University Dalian China Key Laboratory of Network Security and Cryptology Fujian Normal University Fuzhou China

ISBN: (纸本)9781424436934

In this paper, we present a new concept of a strong designated verifier ring signcryption scheme. We argue that this is an important cryptographic primitive that can be used to protect privacy and authenticity of a collection of users who are connected through an ad-hoc network, such as Blue ***,the proposed scheme provides a way that leaks authoritative secrets to only a designated person anonymously by one of the group members and no one knows that the secret is from a group member or the recipient, except the *** cryptographic primitive can be used in an anonymous *** can effectively protect an informant for his/her identity is ambiguous. It can also guarantee the security of prosecution contents because all prosecutions are encrypted ,non-transferable and can't be *** also present an efficient strong designated verifier ring signcryption scheme based on bilinear *** cryptanalysis,our scheme is anonymous,nontransferable, indistinguishable under chosen plaintext attack, and unforgeable. ©2009 IEEE.

关键词： Public key cryptography

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Improved EMD steganography with great embedding rate and high embedding efficiency

Improved EMD steganography with great embedding rate and hig...

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IIH-MSP 2009 - 2009 5th International Conference on Intelligent Information Hiding and Multimedia Signal Processing

作者： Qu, Zhiguo Fu, Yu Niu, Xinxin Yang, Yixian Zhang, Ru Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9780769537627

EMD steganographic method by exploiting modification direction in the host images to send secret messages was proposed by Zhang et al. Comparing with other steganographic algorithms, its highlight is high embedding efficiency. In this paper, we describe a new novel method of steganography based on bese idea of EMD embedding, which builds up the multilevel for the secret messages and decreases the redundancy of the host image's transparency for better embedding rate. In order to obtain better transparency of images and conveniency of algorithm, embedding modification does not happen on LSB of the pixels but frequency coefficients in new improved EMD method. The results of experiments show that the proposed method has better performances on the embedding efficiency and the embedding rate than the EMD steganography. © 2009 IEEE.

关键词： Steganography

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A model for real-time simulation of large-scale networks based on network processor

A model for real-time simulation of large-scale networks bas...

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2009 2nd IEEE International Conference on Broadband network and Multimedia technology, IEEE IC-BNMT2009

作者： Xiaobo, Xu Kangfeng, Zheng Yixian, Yang Guoai, Xu Key Laboratory of Network and Information Attack and Defense Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781424450053

Real-time network simulation refers to simulating computer networks in real time so that the virtual network can interact with real implementations of network protocols, network services, and distributed applications. This paper proposes a new model for real-time simulation of large-scale networks based on powerful network processor. The scheme takes advantage of discrete event system simulation model to simulating large-scale network. This paper describes the implementation of network simulation technology based on Intel IXP2400 platform. Experiment results show that the model can simulate large-scale network, learn routing entries automatically and forward packets at wire-speed. ©2009 IEEE.

关键词： network protocols

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OverFly-A Client-Enhanced Publish-Subscribe System

OverFly-A Client-Enhanced Publish-Subscribe System

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International Conference on Grid and Cooperative computing (GCC)

作者： Bowen Kan Yongqiang He Haojie Zhou Li Zha Key Laboratory of Network Science and Technology Institute of Computing Technology Chinese Academy and Sciences Beijing China

This paper presents OverFly, a large-scale publish-subscribe system developed to support our grid middleware, Vega grid operating system, short as GOS. OverFly differs from most existing publish-subscribe systems in three ways. First, it introduces a message store at the client-side which enables clients to be more resilient to intermittent system faults such as intermittent network partitions and intermittent event broker errors. The client message store also enables further optimizations, such as messages packing and compression. Second, it proposes a transparent topic location and relocation design scheme, with which OverFly can tolerate permanent event broker crashes. Third, it provides a delegation model for sending and receiving messages. Besides flexibility, the delegation model can optimize system usages in single machine environments as well as interconnected environments.

关键词： Publish-subscribe Subscriptions Middleware Grid computing Large-scale systems Operating systems Computer crashes Power system modeling Collaborative work Computer architecture

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Approximating Bounded Degree Maximum Spanning Subgraphs

Approximating Bounded Degree Maximum Spanning Subgraphs

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第八届运筹学及其应用国际研讨会

作者： Wangsen Feng Hao Ma Bei Zhang Hanpin Wang Key Laboratory of Network and Software Security Assurance Ministry of Education Computing CenterPeking University School of EECS Peking University

The bounded degree maximum spanning subgraph problem arising from wireless mesh networks is studied *** a connected graph G and a positive integer d≥2,the problem aims to find a maximum spanning subgraph H of G with the constraint:for every vertex v of G,the degree of v in H,d（v）,is less than or equal to ***,a spanning subgraph is a connected subgraph which contains all the vertices of the original *** propose polynomial time approximation algorithms for cardinality case and edge weighted case *** input graphs are edge unweighted,a 2-approximation algorithm is *** input graphs are edge weighted,the designed algorithm always outputs a spanning subgraph whose maximum degree is no more than d+1 and weight is at least(OPT（G）/（d+2）,where OPT（G） is the weight of optimal *** bounded degree spanning subgraph output by the algorithm can be used as a transport subnetwork in wireless mesh networks.

关键词： Approximating Bounded Degree Maximum Spanning Subgraphs

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The Algorithm of Short Message Hot Topic Detection Based on Feature Association

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Information technology Journal 2009年第2期8卷 236-240页

作者： Sun, Qindong Wang, Qian Qiao, Hongli School of Computer Science and Engineering Xi'an University of Technology Xi'an 710048 China Network Computing and Security Key Lab of Shaanxi Xi'an University of Technology Xi'an 710048 China

Aiming at the mobile short message (SMS) hot topic extraction, the text features and statistical regularity of SMS are analyzed in this study. The formal description of SMS hot topic is given and an algorithm of SMS hot topic extraction based on feature association analysis is proposed. According to the proposed algorithm, feature words of SMS can be clustered into different word bags by calculating the association degree of these feature words and the hot topic can be identified by means of word bags matching. Experiments results show that the proposed algorithm can detect the hot topic in the SMS messages effectively, which is useful to the analysis of SMS popular sentiments. © 2009 Asian network for Scientific Information.

关键词： Data mining

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Customer behavior pattern discovering based on mixed data clustering

Customer behavior pattern discovering based on mixed data cl...

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2009 International Conference on Computational Intelligence and Software Engineering, CiSE 2009

作者： Cheng, Mingzhi Xin, Yang Tian, Yangge Wang, Cong Yang, Yixian Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Key Laboratory of Network and Information Attack and Defence Technology Ministry of Education Beijing University of Posts and Telecommunications China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing China International School of Software Wuhan University Wuhan China

ISBN: (纸本)9781424445073

To be effective to retain customers and enhance the marketing capabilities, it is necessary to improve the personalization of e-commerce systems. Clustering is a reliable and efficient technology to provide personal service in e-commerce system. However, current research on clustering algorithm usually based on numeric data or categorical data. To analysis customer behavior, mixed data set must be handled. With extending the ROCK algorithm, a novel method to deal with mixed data set was proposed and experiment shows the new algorithm is efficient and successful. ©2009 IEEE.

关键词： Electronic commerce

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