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Quantifying presence using calling patterns

Quantifying presence using calling patterns

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International Conference on Communication Systems Software and Middleware (COMSWARE)

作者： Husain Husna Santi Phithakkitnukoon Enkh-Amgalan Baatarjav Ram Dantu Network Security Laboratory Department of Computer Science and Engineering University of North Texas Denton TX USA

Presence technology is going to be an integral part of the next generation of communication technology. It can eliminate telephone tag between two parties (caller and callee), which will increase productivity of the parties and reduce unnecessary bandwidth usage of unwanted calls. In this paper, we propose a Willingness Estimator that computes willingness level of a callee for receiving calls from a specified caller. By knowing the willingness value of the callee the caller can decide on proceeding with the call or not. The proposed Willingness Estimator is tested with real mobile user data, and these results are highly accurate. We measure willingness based on calling patterns (arrival time, location, day) of a caller to a callee and this could serve as one of the future presence based services. The results can be used in telecommunication networks such as PSTN, Cellular networks, and Voice over IP networks.

关键词： Communications technology network servers Mobile handsets Intrusion detection computer security Laboratories computer science Next generation networking Telephony Productivity

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Behavior analysis of spam botnets

Behavior analysis of spam botnets

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International Conference on Communication Systems Software and Middleware (COMSWARE)

作者： Husain Husna Santi Phithakkitnukoon Srikanth Palla Ram Dantu Network Security Laboratory Department of Computer Science and Engineering University of North Texas Denton TX USA

Compromised computers, known as bots, are the major source of spamming and their detection helps greatly improve control of unwanted traffic. In this work we investigate the behavior patterns of spammers based on their underlying similarities in spamming. To our knowledge, no work has been reported on identifying spam botnets based on spammerspsila temporal characteristics. Our study shows that the relationship among spammers demonstrates highly clustering structures based on features such as content length, time of arrival, frequency of email, active time, inter-arrival time, and content type. Although the dimensions of the collected feature set is low, we perform principal component analysis (PCA) on feature set to identify the features which account for the maximum variance in the spamming patterns. Further, we calculate the proximity between different spammers and classify them into various groups. Each group represents similar proximity. Spammers in the same group inherit similar patterns of spamming a domain. For classification into Botnet groups, we use clustering algorithms such as Hierarchical and *** identify Botnet spammers into a particular group with a precision of 90%.

关键词： Principal component analysis Unsolicited electronic mail Filtering Pattern analysis computer security Laboratories computer science computer networks Communication system traffic control Frequency

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Reliable Data Dissemination with Diversity Multi-Hop Protocol for Wireless Sensors network

Reliable Data Dissemination with Diversity Multi-Hop Protoco...

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International Conference on Advanced Communication Technology (ICACT)

作者： Salman Khan Eui-Nam Huh Imran Rao Department of Computer Engineering Internet Computing and Network Security Laboratory Kyung Hee University South Korea Department of Computer Science and Software Engineering University of Melbourne Australia

The growing needs to support efficient data communications in wireless sensor networks (WSN) cannot be ignored. The resource constrained nature of WSN requires it to efficiently transmit the data with little consumption of network resources. We present a gossip based K - BackTrack (KBT) reliable data dissemination protocol for unstructured ad-hoc WSNs 1 . The goal of our proposed protocol is to ensure reliable data delivery and, at the same time, keeping the overhead associated with reliability low. The basic idea we employ is that each node to delay the acknowledgement message until it reaches K th hop in the WSN. Then the K th node then acknowledge the receipt of the message to the source directly. By increasing the value of K, we can minimize the network traffic. Moreover, the data dissemination in our proposed protocol exhibits low bandwidth cost (by minimizing the acknowledgement) and increases network lifetime (since critical sensors, ie. close to the control center are not overused). Through extensive experimental evaluation and comparison, our findings demonstrate that our protocol achieves significant improvements in energy efficiency and network lifetime.

关键词： Spread spectrum communication Wireless application protocol Wireless sensor networks Telecommunication network reliability Data communication Delay Communication system traffic control Bandwidth Costs Energy efficiency

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Propagation Service Decision Method for Web Services Composition in u-Lifecare System

Propagation Service Decision Method for Web Services Composi...

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International Conference on Computational Science and its Applications (ICCSA)

作者： Ki-moon Choi Mohammad Mehedi Hassan Eui-Nam Huh Internet Computing and Network Security Laboratory Department of Computer Engineering Kyung Hee University Yongin si Gyeonggi South Korea

In Web environment, multiple Web service(WS)s may provide similar functionalities with different nonfunctional property values (e.g. different QoS metrics). Quality of service (QoS) metrics of WSs are critical factors to select appropriate WSs execution path in WSs composition as it requires expensive computation cost to find out appropriate execution path in Web environment, i.e O(MN) assuming that there will be M candidate services and N WSs in composition model. Thus, it is very important to decide which service execution path will be more suitable to users in execution time. Existing methods find execution path in design time which is inefficient as the QoS metrics of WSs are changed frequently in real time. Thus, in this paper, we propose a dynamic service execution path selection method called PSDM (propagation service decision method) in execution time for web service composition in u-Lifecare system. The proposed scheme is analyzed and experiment results are shown in terms of frequency of service execution path.

关键词： Web services Quality of service computer networks Availability Computational efficiency Frequency Throughput Costs Application software IP networks

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An Efficient Grid Based Metadata Processing And Sharing Architecture For GEOSS

An Efficient Grid Based Metadata Processing And Sharing Arch...

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International Conference on Advanced Communication Technology (ICACT)

作者： Mohammad Mehedi Hassan Eui-Nam Huh Internet Computing and Network Security Laboratory Department of Computer Engineering Kyung Hee University Yongin si Gyeonggi South Korea

The global earth observation system of systems (GEOSS) is being developed as a framework for existing and future Earth observation systems which will be comprehensive, coordinated and sustainable. Many earth observation (EO) resources have been created, and are available to the global community, in order to support scientists, decision makers, and the general populace. To realize a successful GEOSS, the key is to provide mechanisms that enable EO data and geospatial data from those resources to be processed, shared and coordinated. In this paper, we propose an architecture for GEOSS which aims at providing a metadata extraction and management system for EO and geospatial data and sharing these data transparently, efficiently and securely in a grid environment.

关键词： Global Earth Observation System of Systems computer networks Grid computing Data mining computer architecture Environmental management Information technology Power system management Distributed computing IP networks

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A Grid-enabled framework of expertise search engine using Web-based online communities

A Grid-enabled framework of expertise search engine using We...

引用

International Conference on computer and Information Technology (ICCIT)

作者： Mohammad Mehedi Hassan Pil-Woo Lee Eui-Nam Huh Department of Computer Engineering Internet Computing and Network Security Laboratory Kyung Hee University South Korea KISTI Daejeon South Korea

Existing search engines like Google, Yahoo!, Live etc. are not yet capable to answer queries that require deep semantic understanding of the query or the document. Instead, it is preferable to find and ask someone who has related expertise or experience on a topic and thus Web-based online communities have become important places for people to seek and share expertise. We need to gather the data that describes these online communities. But extracting, aggregating and analyzing data from these communities for finding experts on a single framework is a challenging task. Also there is no universal standard data structure for the outline of user participation in these communities. In this paper, we present a Grid-enabled framework of expertise search (GREFES) engine which utilizes online communities as sources for experts on various topics. This is a work in progress. We also propose an open data structure called SNML (Social network Markup Language) to outline user participation in online communities. The architecture addresses major challenges in crawling of community data and query processing by utilizing Grid. An expert ranking algorithm is also discussed and evaluated.

关键词： Search engines Distributed computing computer networks Grid computing Data analysis Data structures Social network services Query processing Online Communities/Technical Collaboration IP networks

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五谱值函数的构造

五谱值函数的构造

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中国密码学会2009年会

作者： Xie Min 谢敏 Li Juan 李娟 Zhang Feng-rong 张凤荣 Key laboratory of computer network and information security(Xidian University) Xi'an 710071 Guangdo 西安电子科技大学计算机网络与信息安全教育部重点实验室西安 710071 广东省信息安全技术重点实验室(广州大学)广州 510405 School of Electrical Engineering(Northwest University of Nationalities) Lanzhou 730030 西北民族大学电气工程学院兰州 730030 Key laboratory of computer network and information security(Xidian University) Xi'an 710071 西安电子科技大学计算机网络与信息安全教育部重点实验室西安 710071

在密码体制的构造中，布尔函数被广泛地应用，对分组密码中S-盒和流密码中组合生成器等的研究，实质上可归结为对布尔函数的分析.通过分析Bent函数的性质，利用级联的方法，构造了一类五谱值函数.该类函数没有非零线性结构、平衡、代数... 详细信息

在密码体制的构造中，布尔函数被广泛地应用，对分组密码中S-盒和流密码中组合生成器等的研究，实质上可归结为对布尔函数的分析.通过分析Bent函数的性质，利用级联的方法，构造了一类五谱值函数.该类函数没有非零线性结构、平衡、代数次数可达到变元个数的一半.并且，该类函数的代数免疫阶等于所级联的Bent函数的代数免疫阶加1.

关键词：密码学五谱值函数代数次数代数免疫阶

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Experiences in building a multi-university testbed for research in multimedia communications

Experiences in building a multi-university testbed for resea...

引用

International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Ram Dantu Henning Schulzrinne Paul Sroufe Network Security Laboratory Department of Computer Science & Engineering University of North Texas Denton TX USA Department of Computer Science Columbia University New York NY USA

The next generation Internet needs to support multimedia services such as voice/video over IP (VoIP) and IP-based television (IPTV) and media distribution. The goal of the project is to develop a testbed for understanding and analysis of vulnerabilities of IP-based multimedia networks. This is a collaborative project between University of North Texas, Columbia University, Purdue University, and University of California at Davis. This project was awarded in 2006 and in one year, we have developed a multi-university testbed with variety of PBX solutions including Asterisk, a multitude of voice and video IP phones, and multiple universities were connected through a secure VPN and Internet!. As with any endeavor, experiences and we have many unique issues, which sometimes cause setbacks. We have dealt with issues concerning interoperability between phones and servers, network address translation (NAT) connectivity issues, and many other collaboration issues concerning people and technology. An interworking of students from multiple universities, faculty, system administrators and support personnel has brought the testbed resources together for a working environment. In this paper we described our progress and experiences in more detail and how to fulfill our mission statement while supporting the various collaborative efforts involved with this project. In addition, we described the current research activities based on the testbed. Finally we described the next steps in the testbed development.

关键词： Testing Multimedia communication network address translation Collaborative work Web and internet services TV IPTV Collaboration Virtual private networks network servers

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Storage Requirements for Key Distribution in Sensor networks

Storage Requirements for Key Distribution in Sensor Networks

引用

International Conference on Sensor Technologies and Applications, SensorComm

作者： Zhihong Liu Jianfeng Ma Qiping Huang SangJae Moon Key Laboratory of Computer Networks and Information Security of Ministry of Education Xidian University China School of Communication Engineering Xidian University China Mobile Network Security Technology Research Center Kyungpook National University South Korea

ISBN: (纸本)9781424432127

Sensor networks are resource-constrained, which makes developing efficient key distribution scheme a challenging problem. In general, many key distribution techniques are designed to address the trade-off between limited resources and security, no key distribution technique is ideal to all the scenarios where sensor networks are used. In this paper, we primarily focus on storage requirements of several key distribution schemes in sensor networks, and obtain their lower bounds on the amount of information each user has to keep secret by modeling the key distribution schemes with an information theoretic framework.

关键词： Cryptography security Complexity theory Servers Entropy Memory management Protocols

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Keying material based key pre-distribution scheme

Keying material based key pre-distribution scheme

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IEEE International Conference on Intelligence and security Informatics, ISI

作者： Zhihong Liu Jianfeng Ma Qiping Huang SangJae Moon Key Laboratory of Computer Networks and Information Security of Ministry of Education Xidian University Xi'an China School of Communication Engineering Xidian University Xi'an China Mobile Network Security Technology Research Center Kyungpook National University South Korea

A key pre-distribution scheme is a method by which initially an off-line trusted authority T A distributes pieces of information among a set of users. Later, each member of a group of users can compute a common key for secure communication. In this paper we present a Keying Material Based Key Pre-distribution Scheme, i.e., a group of users, using secret information preloaded in their memory and some public information retrieved from a keying material server, can compute a common key. We first formally define the keying material based key pre-distribution scheme in terms of the entropy, and give lower bounds on the amount of information each user has to keep secret. Then, we describe its applications for sensor networks.

关键词： Base stations Information security Moon Information retrieval network servers Public key cryptography computer networks Electronic mail National security Protocols

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