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作者： Joshi, James B. D. Bertina, Elisa Ghafoor, Arif Department of Information Sciences and Telecommunications University of Pittsburgh Pittsburgh PA 15260 United States Department of Computer Science Purdue University West Lafayette IN 47907 United States School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907 United States Department of Information Sciences and Telecommunications School of Information Sciences University of Pittsburgh United States University of Pittsburgh United States Computer Science Department Purdue University United States CERIAS United States San Jose CA United States Microelectronics and Computer Technology Corporation Rutgers University Telcordia Technologies United States School of Electrical and Computer Engineering Purdue University West Lafayette IN United States Distributed Multimedia Systems Laboratory Information Infrastructure Security Research Laboratory United States

The Generalized Temporal Role-Based Access Control (GTRBAC) model provides a comprehensive set of temporal constraint expressions which can facilitate the specification of fine-grained time-based access control policies. However, the issue of the expressiveness and usability of this model has not been previously investigated. In this paper, we present an analysis of the expressiveness of the constructs provided by this model and illustrate that its constraints-set is not minimal. We show that there is a subset of GTRBAC constraints that is sufficient to express all the access constraints that can be expressed using the full set. We also illustrate that a nonminimal GTRBAC constraint set can provide better flexibility and lower complexity of constraint representation. Based on our analysis, a set of design guidelines for the development of GTRBAC-based security administration is presented. © 2005 IEEE.

关键词： Security of data

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DMC - distributed and Mobile Collaboration Workshop Report

DMC - Distributed and Mobile Collaboration Workshop Report

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IEEE International Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises (WET ICE)

作者： S. Dustdar H. Gall N. Mehandjiev S. Tata Distributed Systems Group University of Technology Vienna Austria Institut für Informatik Universität Zürich Switzerland School of Informatics University of Manchester Institute of Science and Technology UK Department of Computer Science GET/INT Evry France

The increased need for people and organizations to continue collaborating whilst changing physical location and crossing organizational boundaries has resulted in a wave of new supporting technologies, and generated interest in tackling some of the difficult research issues arsing in such a context. The latter was the subject of the Third IEEE International Workshop on distributed and Mobile Collaboration (DMC) at WETICE 2005, summirized here. The DMC Workshop included 10 full papers on topics grouped into four areas: Web-based collaboration, Formal description and consistency checking of collaborative processes, Models and architectures for collaborative services, and P2P collaborative infrastructures. The discussions at the workshop outlined several important issues regarding the field of distributed collaborative applications.

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Journal of Information science and Engineering: Editorial notice

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Journal of Information science and Engineering 2005年第5期21卷 i-ii页

作者： Lee, Der-Tsai Amato, Nancy M. Chang, Shih-Fu Chen, Homer H. Chen, Tsuhan Hsu, Tsan-Sheng Hwang, Jenq-Neng Kuo, Sy-Yen Kuo, Tei-Wei Li, Chung-Sheng Tokuyama, Takeshi Wing, Jeannette Wu, Tzong-Chen Yen, John Computer Science at Texas A and M University United States Parasol Laboratory United States IEEE Transactions on Parallel and Distributed Systems Computing Research Association's Committee on the Status of Women in Computing Research CRA-W's Distributed Mentor Program United States Department of Electrical Engineering Columbia University United States Lab. United States College of Electrical Engineering and Computer Science National Taiwan University Taiwan IEEE Transactions on Circuits and Systems for Video Technology IEEE Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States ACM ACM SIGACT IEEE Computer Society IICM Austria Research and Development of the Department Multimedia Signal Processing Technical Committee IEEE Signal Processing Society United States IEEE Transactions on Circuits and systems for Video Technology College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan IEEE Technical Committee on Real-Time Systems Computer Science Division IBM T.J. Watson Research Center United States IBM Research Division Graduate School of Information Sciences Tohoku University Japan ACM IPSJ Mathematical Society of Japan Japan Department of Computer Science Computer Science Department Carnegie Mellon University United States National Academies of Science's Computer Science and Telecommunications Board United States Microsoft's Trustworthy Academic Advisory Board Intel Research Pittsburgh's Advisory Board United States Dartmouth's Institute for Security Technology Studies Advisory Committee Canada Sloan Research Fellowships Program Committee United States ACM Taiwan China Information Sciences and Technology Pennsylvania State University United States Laboratory for Intelligent Agents Penn State's School of Info

No abstract available

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Generating realistic workloads for network intrusion detection systems

Generating realistic workloads for network intrusion detecti...

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Proceedings of the Fourth International Workshop on Software and Performance, WOSP'04

作者： Antonatos, Spyros Anagnostakis, Kostas G. Markatos, Eyangelos P. Institute of Computer Science Found. for Research and Technology Hellas Greece Distributed Systems Lab. CIS Department Univ. of Pennsylvania United States

ISBN: (纸本)1581136730

While the use of network intrusion detection systems (nIDS) is becoming pervasive, evaluating nIDS performance has been found to be challenging. The goal of this study is to determine how to generate realistic workloads for nIDS performance evaluation. We develop a workload model that appears to provide reasonably accurate estimates compared to real workloads. The model attempts to emulate a traffic mix of different applications, reflecting characteristics of each application and the way these interact with the system. We have implemented this model as part of a traffic generator that can be extended and tuned to reflect the needs of different scenarios. We also present an approach to measuring the capacity of a nIDS that does not require the setup of a full network testbed. security, intrusion detection, workload characterization and generation.

关键词： computer networks

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Music2Share - Copyright-compliant music sharing in P2P systems

Music2Share - Copyright-compliant music sharing in P2P syste...

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作者： Kalker, Ton Epema, Dick H. J. Hartel, Pieter H. Lagendijk, R.L. Van Steen, Maarten Philips Research Eindhoven Eindhoven 5656 AA Netherlands Technical University Eindhoven Eindhoven 5612 AZ Netherlands Parallel and Distributed Systems Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft 2600 GA Netherlands Distributed and Embedded Systems Group Department of Computer Science University of Twente Enschede 7500 AE Netherlands Delft University of Technology Delft 2628 CD Netherlands Department of Computer Science Vrije Universiteit Amsterdam 1081 HV Netherlands

Peer-to-peer (P2P) networks are generally considered to be free havens for pirated content, in particular with respect to music. We describe a solution for the problem of copyright infringement in P2P networks for music sharing. In particular, we propose a P2P protocol that integrates the functions of identification, tracking, and sharing of music with those of licensing, monitoring, and payment. This highly decentralized music-aware P2P protocol will allow access to large amounts of music of guaranteed quality;it merges in a natural way the policing functions for copyright protection·and an efficient music-management infrastructure for the benefit of the user. © 2004 IEEE.

关键词： Copyrights

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The Evolution of Link-Attributes for Pages and Its Implications on Web Crawling 04

The Evolution of Link-Attributes for Pages and Its Implicati...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Tao Meng Hongfei Yan Jimin Wang Xiaoming Li Computer Networks and Distributed Systems Laboratory Department of Computer Science and Technology Peking University Beijing China

ISBN: (纸本)9780769521008

It is important for an incremental crawler to know how web pages evolve and the relation between their changing frequencies and the link-attributes such as indegrees. This paper proposes a model for incremental crawling and performs an experiment to verify the correlation between them, by monitoring the evolution of all the link-attributes of the web pages within one website. Particularly, we look deeply into one special kind of page named Index-pages. From the experiment, we can make four conclusions: (1) Pages which have bigger indegrees, outdegrees or PageRank values change more often, and these link-attributes all approximately obey a power-law distribution. (2) The link-attributes of pages seldom change though the pages change themselves. (3) A small proportion of the pages link to most of the vertexes in the web graph. (4) The Index-pages link to sizeable new pages in a website. These conclusions can be used to greatly enhance the performance of an incremental crawler, which is the foremost component for general search engines and web information stores.

关键词： Crawlers Web pages Frequency computer networks Laboratories computer science Monitoring Search engines Internet World Wide Web

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Performance analysis of content matching intrusion detection systems

Performance analysis of content matching intrusion detection...

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Symposium on Applications and the Internet (SAINT)

作者： S. Antonatos K.G. Anagnostakis E.P. Markatos M. Polychronakis Institute of Computer Science Foundation for Research and Technology Hellas Heraklion Greece Distributed Systems Laboratory CIS Department University of Pennsylvania Philadelphia PA USA

Although network intrusion detection systems (nIDS) are widely used, there is limited understanding of how these systems perform in different settings and how they should be evaluated. This paper examines how nIDS performance is affected by traffic characteristics, rulesets, string matching algorithms and processor architecture. The analysis presented in this paper shows that nIDS performance is very sensitive to these factors. Evaluating a nIDS therefore requires careful consideration of a fairly extensive set of scenarios. Our results also highlight potential dangers with the use of workloads based on combining widely-available packet header traces with synthetic packet content as well as with the use of synthetic rulesets.

关键词： Performance analysis Intrusion detection Costs Telecommunication traffic computer security Algorithm design and analysis Traffic control computer science Laboratories Computational Intelligence Society

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Harnessing the potential of mobile personal data repositories 36

Harnessing the potential of mobile personal data repositorie...

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36th Annual Hawaii International Conference on System sciences, HICSS 2003

作者： Karypidis, A. Lalis, S. Distributed Systems Laboratory Institute of Computer Science Foundation for Research and Technology Hellas Greece Department of Computer and Communications Engineering University of Thessaly Greece

ISBN: (纸本)0769518745

In this paper we argue in favor of remote data access based on the principle of abstract data types. This paradigm has inherent advantages over the traditional file-oriented approach, especially when used in a ubiquitous computing environment, where data producers and consumers can be distributed and emerge dynamically. The 'datlet', a mobile storage device that implements the proposed approach, is presented in detail. We also discuss how a datlet can be embedded in everyday objects to create hybrid information objects, leading to an intuitive information manipulation model. © 2003 IEEE.

关键词： Virtual storage

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Enabling design evolution in software through pattern oriented approach

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9th International Conference on Object-Oriented Information systems, OOIS 2003

作者： Ram, D. Janaki Rajasree, M.S. Distributed and Object Systems Lab Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai India

ISBN: (纸本)3540408606

Architectural erosion in software systems results due to the drifting of code from the existing design. This drifting happens because the changes in code supporting evolving requirements, are not reflected back in the design. The ability to control software artifacts produced in various stages of the software development lifecycle is very crucial. Powerful abstractions for modeling software design is essential for supporting evolution. We propose a pattern oriented approach to software development using patterns as building blocks of architecture. We argue that design evolution in software can best be achieved by replacing existing patterns in the design with new patterns addressing present requirements. Support for design evolution by means of a model for pattern substitution is also presented. Using this model, the design is gracefully evolved and the design changes are seamlessly mapped to code thus preventing architectural erosion. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Software design

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Methods for conflict resolution in policy-based management systems

Methods for conflict resolution in policy-based management s...

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International Conference on Enterprise distributed Object Computing (EDOC)

作者： N. Dunlop J. Indulska K. Raymond Harrow School of Computer Science University of Westminster London UK School of Information Technology and Electrical Engineering University of Queensland Australia CRC for Enterprise Distributed Systems Technology Australia

While developments in distributed object computing environments, such as the Common Object Request Broker Architecture (CORBA) by the Object Management Group (2000) and the Telecommunication Intelligent Network Architecture (TINA) by H. Mulder (2002), have enabled interoperability between domains in large open distributed systems, managing the resources within such systems has become an increasingly complex task. This challenge has been considered for several years within the distributed systems management research community and policy-based management has recently emerged as a promising solution. Large evolving enterprises present a significant challenge for policy-based management partly due to the requirement to support both mutual transparency and individual autonomy between domains according to C. Bidan and V. Issarny (1998), but also because the fluidity and complexity of interactions occurring within such environments requires an ability to cope with the existence of multiple, potentially inconsistent policies. This paper discusses the need for providing both dynamic (run-time) and static (compile-time) conflict detection and resolution for policies in such systems and builds on our earlier conflict detection work (Dunlop et al., 2001, 2002) to introduce the methods for conflict resolution in large open distributed systems.

关键词： Environmental management computer architecture computer network management Resource management Telecommunication network management computer networks distributed computing Telecommunication computing Intelligent networks Fluid dynamics

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