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15th ITG/GI Symposium on Communication in distributed systems, KiVS 2007

作者： Gruschka, Nils Herkenhoner, Ralph Luttenberger, Norbert Department of Computer Science Communication Systems Research Group Christian-Albrechts-University of Kiel Germany

ISBN: (纸本)9783800729807

Access control and ensuring availability are important tasks for securing Web Services. Both requirements are not well studied on Web Services and especially not their interactions. However, considering this interaction is crucial. On one hand, access control is an established mechanism for protecting services from attacks targeting the service's availability. On the other hand, enforcing access control on Web Services is a complex task and therefore access control implementations potentially offer new possibilities for attacks. In this paper a solution for Web Service access control enforcement is presented using an event-based processing model focusing on ensuring Web Service availability. © 2007 Institute of Electrical and Electronics Engineers Inc. All Rights Reserved.

关键词： Web services

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Evaluating LTP-T: A DTN-Friendly Transport Protocol

Evaluating LTP-T: A DTN-Friendly Transport Protocol

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International Workshop on Satellite and Space Communications (IWSSC)

作者： Stephen Farrell Vinny Cahill Department of Computer Science Distributed Systems Group Dublin Ireland

The Licklider transmission protocol (LTP) is a delay-tolerant point-to-point protocol being developed by the Delay-Tolerant Networking research group (DTNRG). LTP-Transport is an extension to LTP that provides end-to-end services and which is designed to be a generic Delay-Tolerant Network (DTN) friendly transport protocol. We describe our network emulation based test setup for these protocols and our evaluation of their performance for a few simple DTN scenarios. In particular we compare LTP-T with the other protocol being developed by the DTNRG, the bundle protocol (BP). Our results show that LTP-T can outperform the BP in some cases, though, as an overlay network protocol, the BP is more flexible in general.

关键词： Transport protocols Disruption tolerant networking Testing Emulation Educational institutions computer science Laboratories Satellites Throughput Hardware

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Assessment of code quality through classification of unit tests in VeriNeC

Assessment of code quality through classification of unit te...

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21st International Conference on Advanced Information Networking and ApplicationsWorkshops/Symposia, AINAW'07

作者： Jungo, Dominik Buchmann, David Ultes-Nitsche, Ulrich Telecommunications Networks and Security Research Group Department of Computer Science University of Fribourg Boulevard de Pérolles 90 1700 Fribourg Switzerland

ISBN: (纸本)0769528473

Unit testing is a tool for assessing code quality. Unit tests check the correctness of code fragments like methods, loops and conditional statements. Usually, every code fragment is involved in different tests. We propose a classification of tests, depending on the tested features, which delivers a higher detailed feedback than unclassified tests. Unclassified tests only deliver a feedback whether they failed or succeeded. The detailed feedback from the classified tests help to do a better code quality assessment and can be incorporated in tools helping to improve code quality. We demonstrate the power of this approach doing unit tests on network configuration. © 2007 IEEE.

关键词： Codes (symbols)

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Summary of the Dagstuhl-Seminar "Scalable Data Management in Evolving networks"

Summary of the Dagstuhl-Seminar "Scalable Data Management in...

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Scalable Data Management in Evolving networks 2006

作者： Böttcher, Stefan Gruenwald, Le Marron, Pedro Pitoura, Evaggelia University of Paderborn Computer Science Fürstenallee 11 Paderborn33102 Germany The University of Oklahoma School of Computer Science NormanOK73019 United States University of Stuttgart Computer Science Distributed Systems Group Universitätsstr. 38 Stuttgart70569 Germany University of Ioannina Computer Science Department IoanninaGR45110 Greece

Network technologies like mobile ad-hoc networks, peer-to-peer systems, and sensor networks are getting increasingly popular, but come up with new challenges to scalable data management because data management techniques developed for fixed-wired networks that usually depend on reliable and stable networks can not directly be used. The goal of this Dagstuhl Seminar was to identify common challenges in these popular network technologies problems, and to get a better understanding of the generality and applicability of solutions to the major problems in scalable data management in these areas. © 2007 LZI.

关键词： Sensor networks

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research Issues in Multiple Policy Optimization Using Collaborative Reinforcement Learning

Research Issues in Multiple Policy Optimization Using Collab...

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SEAMS International Workshop on Software Engineering for Adaptive and Self-Managing systems, ICSE

作者： Ivana Dusparic Vinny Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

Self-organizing techniques have successfully been used to optimize software systems, such as optimization of route stability in ad hoc network routing and optimization of the use of storage space or processing power using load balancing. Existing self-organizing techniques typically focus on a single, usually implicitly specified, system goal and tune systems parameters towards optimally meeting that goal. In this paper, we consider optimization of large-scale multi-agent ubiquitous computing environments, such as urban traffic control. Applications in this class are typically required to optimize towards multiple goals simultaneously. Additionally, these multiple goals can potentially be conflicting, change over time, and apply to various parts of the system such as a single agent, a group of agents, or the system as a whole. In contrast to existing self-organizing systems in which agents are homogeneous to the extent that they are working towards a common goal, agents in these systems are heterogeneous in that they may have differing goals. Thus, existing self-organizing optimization techniques must be extended to deal with multiple goal optimization and the resulting heterogeneity of agents. In this paper we present a research agenda for extending collaborative reinforcement learning (CRL), an existing self-organizing optimization technique, to support multiple policy optimization.

关键词： Collaboration Learning Software systems Stability Ad hoc networks Routing Load management Large-scale systems Ubiquitous computing Traffic control

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PISA: P2P Wi-Fi Internet Sharing Architecture

PISA: P2P Wi-Fi Internet Sharing Architecture

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International Conference on Peer-to-Peer Computing

作者： Tobias Heer Shaohui Li Klaus Wehrle Distributed Systems Group Computer Science Department RWTH Aachen University Germany

The demand for cheap broadband Internet for nomadic users has created a market for Internet sharing. Wi- Fi communities which allow their users to share their wired Internet connections have emerged and become increasingly popular. Organizations like FON promise to provide free wireless Internet access in many places. However, user authentication is the Achilles heel of these systems. A user that allows other community members to use its access point must expect to be held responsible for other users' actions. Moreover, these Wi-Fi sharing systems are often insecure which allows eavesdroppers to gather sensitive information on the wireless link. This work provides efficient, scalable, and secure access control for large Wi-Fi sharing systems. The host identity protocol (HIP) is used as a building block for a solution which supports strong user authentication as well as mobility support for nomadic users. In our presentation, we show the feasibility and effectiveness of this approach by demonstrating the PISA authentication protocol in action.

关键词： Internet Authentication Traffic control Cryptography Communication system security Access control Access protocols IP networks Law Hip

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Vs Golf - Developing Location-based Multi-Player Games

Vs Golf - Developing Location-based Multi-Player Games

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Georg Treu Johannes Martens Matthias Schicker Marc Breisinger Axel Kupper Mobile & Distributed Systems Group Department of Computer Science Ludwig-Maximillians-Universität Munich Germany

Location-based multi-player games are currently being pushed by the industry, one main factor being that highly-accurate positioning technologies like GPS as well as broadband mobile networks like UMTS are finally getting widespread. Nevertheless, generic frameworks for efficiently managing user locations are still missing, which strongly complicates game development. This paper presents TraX, a device-centric framework for Location- based Services, which especially supports proactive and multi-player services and thus perfectly matches the challenges mobile game development faces today. The suitability of TraX is evaluated by means of VsGolf, an actual location-based multi-player game, which has been developed and tested by students in only four days.

关键词： Games Global Positioning System Mobile handsets Cellular phones Mobile computing 3G mobile communication Mobile radio mobility management computer science computer industry Toy industry

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End-to-end security across wired-wireless networks for mobile users

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Information systems Security 2007年第5期16卷 264-277页

作者： Zeadally, Sherali Sklavos, Nicolas Rathakrishnan, Moganakrishnan Fowler, Scott Network Systems Laboratory Department of Computer Science and Information Technology University of the District of Columbia Washington DC United States University of Patras Patras Greece Dow Jones and Company South Brunswick NJ United States Adaptive Communications Networks Research Group Aston University Birmingham United Kingdom

Recent advances in mobile computing and wireless communication technologies are enabling high mobility and flexibility of anytime, anywhere service access for mobile users. As a result, network connections of such users often span over heterogeneous networking environments consisting of wired and wireless networking technologies. Both network heterogeneity and user mobility make the securing of data transmission over heterogeneous networks challenging and complex. In this paper, we focus on the challenge of providing secure end-to-end network transmissions to wireless mobile users. To minimize service interruption during ongoing secure sessions of mobile users, we present the design and implementation of an approach based on the well-known Internet Protocol Security (IPSec) standard. We conducted a performance evaluation of our implementation using a Voice over IP (VoIP) application over an actual network testbed. Our empirical performance results demonstrate a packet loss improvement of 17% to 34% (for various VoIP packet sizes) and a handoff delay improvement of almost 24% validating the high efficiency of our proposed approach. © 2007 Taylor & Francis.

关键词： WIRELESS communication systems MOBILE computing ELECTRONIC data processing PORTABLE computers DATA transmission systems computer software DATABASES INFORMATION processing INTERNET protocols computer network resources

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Assessment of Code Quality through Classification of Unit Tests in VeriNeC

Assessment of Code Quality through Classification of Unit Te...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Dominik Jungo David Buchmann Ulrich Ultes-Nitsche Telecommunications networks & security Research Group Department of Computer Science University of Freiburg Fribourg Switzerland

关键词： Testing Feedback Best practices Quality assessment Runtime computer security computer science Java Writing Quality management

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IEEE radio communications - Components, systems, and networks

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IEEE COMMUNICATIONS MAGAZINE 2007年第9期45卷 38-38页

作者： Evans, Joseph Zvonar, Zoran Department of Electrical Engineering and Computer Science Research Information Technology University of Kansas Lawrence KS United States Division of Computer and Network Systems Department for Computer and Information Science and Engineering National Science Foundation United States Systems Engineering Group RF and Wireless System Business Unit Analog Devices

No abstract available

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