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Impact analysis of faults and attacks in large-scale networks

IEEE Security and Privacy 2003年第5期1卷 49-54页

作者： Hariri, Salim Guangzhi, Q.U. Dharmagadda, Tushneem Ramkishore, Modukuri Raghavendra, Cauligi S. University of Arizona Tucson University of Southern California Department of Electrical and Computer Engineering University of Arizona Next Generation Network Centric Systems ITL Lab. University of Arizona Tucson AZ 85719 Analog Devices Company Wilmington MA Department of Electrical Engineering-Systems USC

An agent-based framework for the impact analysis of faults and attacks in large-scale networks is discussed. The framework is used to discover attack points and to examine the behavior of critical network components during an attack or system fault. The two common types of attacks are server attacks such as TCP SYN, and ICMP flood, and routing attacks, such as distributed denial-of-service (DDoS) attacks. In network attacks, attackers overwhelm the target system with a continuous flood of traffic designed to consume all system resources. The framework analyze the impact of multiple failures on overall system behavior and identify critical resources and vulnerabilities.

关键词： Telecommunication networks

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Erratum to “Dynamic focus control in high-speed optical coherence tomography based on a microelectromechanical mirror” [Opt. Commun. 232 (2004) 123]

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Optics Communications 2004年第1期234卷 443-443页

作者： Bing Qi Phillip A. Himmer Maggie L. Gordon Victor X.D. Yang David L. Dickensheets I.Alex Vitkin Ontario Cancer Institute/University Health Network University of Toronoto Toronto ON Canada M5G 2M9 Department of Electrical and Computer Engineering Montana State University Bozeman MT 59717 USA Department of Medical Biophysics University of Toronto Toronto ON Canada M5G 2M9 Department of Radiation Oncology University of Toronto ON Canada M5G 2M9

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A two-phase scatternet formation protocol for Bluetooth wireless personal area networks

A two-phase scatternet formation protocol for Bluetooth wire...

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2003 IEEE Wireless Communications and networking Conference: The Dawn of Pervasive Communication, WCNC 2003

作者： Kawamoto, Yoji Wong, Vincent W. S. Leung, Victor C. M. Network and Software Technology Center Sony Corporation Tokyo Japan Department of Electrical and Computer Engineering University of British Columbia VancouverBC Canada

ISBN: (纸本)0780377001

Bluetooth is a promising short-range radio technology for wireless personal area networks. There is an interest to expand the coverage of such networks by interconnecting them to form scatternets. Most of the scatternet formation algorithms recently proposed in the literature do not support dynamic topology changes, and the master of bridge nodes in the resulting scatternet may become the traffic bottleneck and reduce network throughput. In this paper, we propose a two-phase scatternet formation (TPSF) protocol to support dynamic topology changes while maintaining a high aggregate throughput. In the first phase, a control scatternet is constructed to support topology changes and route determination. The second phase creates a separate on-demand scatternet whenever a node wants to initiate data communications with another node. The on-demand scatternet is torn down when the data transmissions are finished. Since all the time slots in an on-demand scatternet are dedicated to a single communication session, a high aggregate throughput is achieved at the expense of a slightly higher connection setup delay. © 2003 IEEE.

关键词： Bluetooth

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Video Presentation Recording and On-Line Broadcasting

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Journal of Interconnection networks 2003年第2期04卷 199-209页

作者： Timothy K. Shih Ying-Hong Wang Yi-Chun Liao Jung-Ken Chuang Multimedia Information Network Lab Department of Computer Science and Information Engineering Tamkang University. Taiwan ROC Department of Computer Science and Information Engineering Tamkang University Taiwan ROC Multimedia Information Network Lab Department of Computer Science and Information Engineering Tamkang University Taiwan ROC

Distance learning programs use on-line video records to deliver pre-recorded lectures. And, video communication systems can be used as a discussion tool. In this paper, we start our discussion on a multimedia presentation recording system which we had developed. We then present how the video recording concept can be further extended to realize an augmented video conferencing system, which can be used as a peer-to-peer discussion tool, as well as a lecture broadcasting system. We also point out that an object tracking technology can be further integrated to enhance the tool, to enable a more realistic and useful system for the discussion in distance education.

关键词： Video conferencing distance learning MPEG multimedia communication system synchronization

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Augmented video conferencing 23

Augmented video conferencing

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23rd International Conference on Distributed Computing Systems Workshops, ICDCSW 2003

作者： Shih, T.K. Chuang, Jung-Ken Lin, N.H. He, A. Multimedia Information Network Lab. Department of Computer Science and Information Engineering Tamkang University Taiwan Core and Information Technology Center University of Aizu Japan

ISBN: (纸本)0769519210

关键词： Video recording

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Efficient architecture for exponentiation and division in GF(2m) using irreducible AOP

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International Conference on Computational Science and its Applications, ICCSA 2003

作者： Lee, Won-Ho Heo, Young-Jun Yoo, Kee-Young Department of Computer Engineering Kyungpook National University Daegu702-701 Korea Republic of Network Security Department ETRI Daejeon305-350 Korea Republic of

ISBN: (纸本)3540401555

The important arithmetic operations over finite fields include exponentiation, division, and inversion. An exponentiation operation can be implemented using a series of squaring and multiplication operations over GF(2m) using a binary method, while division and inversion can be performed by the iterative application of an AB2 operation. Hence, it is important to develop a fast algorithm and efficient hardware for squaring, multiplication, and AB2 operations. The current paper presents new architectures for the simultaneous computation of multiplication and squaring operations, and the computation of an AB2 operation over GF(2m) generated by an irreducible AOP of degree m. The proposed architectures offer a significant improvement in reducing the hardware complexity compared with previous architectures, and can also be used as a kernel circuit for exponentiation, division, and inversion architectures. Furthermore, since the proposed architectures include regularity, modularity and concurrency, they can be easily designed on VLSI hardware and used in IC cards. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Iterative methods

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A computationally efficient and secure time scheme for wireless applications

A computationally efficient and secure time scheme for wirel...

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58th IEEE Vehicular Technology Conference, VTC 2003-Fall

作者： Barnett, C.A. Liu, K.J.R. Hughes Network Systems GermantownMD United States Electrical and Computer Engineering Department University of Maryland College ParkMD United States

ISBN: (纸本)0780379543

Wireless mobile computing devices are used extensively to access the Internet for critical applications and services, which must be secured by computationally efficient algorithms and schemes. Computationally efficient security schemes, however, require accurate time synchronization between client and application servers, which is very challenging due to its susceptibility to stochastic noise on the transmission path and to message delay attacks where an adversary can intentionally delay measurement messages in order to compromise the scheme. In statistically noisy networks, accurate time synchronization requires filtering of a large number of measurements to reduce stochastic noise. Each measurement must be secured and, therefore, computationally efficient schemes are required to facilitate mobile computing. Efficient security schemes are also required to detect message delay attacks and to authenticate synchronization message sources (e.g. multicast host server and clients). We propose a computationally efficient time synchronization scheme, which achieves accurate and reliable time clock-offset estimates from a single measurement. This approach is based on a per node quality of service scheme, which can be easily incorporated into existing and emerging quality of service scheduling disciplines. It is designed to reduce stochastic noise by providing per node delay guarantee for synchronization. We also propose an efficient and reliable scheme to detect message delay attack. The proposed scheme compares synchronization messages round trip delay with predefined thresholds to ensure that they fall within expected limits, otherwise they are discarded. © 2004 IEEE.

关键词： Quality of service

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A requirements patterns-driven approach to specify systems and check properties

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2648卷 18-33页

作者： Konrad, Sascha Campbell, Laura A. Cheng, Betty H. C. Deng, Min Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI 48824 United States

We previously developed a framework, Hydra, for adding formal semantics to a collection of UML diagrams that enable the automated derivation of formal language specifications for those diagrams. Recently, we have also identified a number of requirements patterns for embedded systems that includes sample UML structural and behavioral diagrams for modeling requirements and high-level design for embedded systems. This paper describes a requirements patterns-driven approach for developing UML diagrams for embedded systems, where each pattern has a constraints section to specify safety and other invariant properties. We show how the diagrams for an industrial automotive system, via specifications generated from Hydra, can be automatically analyzed for adherence to these formally specified constraints using the SPIN model checker. We developed the MINERVA framework to support the graphical construction of UML diagrams and to visualize the results from the SPIN analysis in terms of the original UML diagrams. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Embedded systems

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Recent advances in modeling response-time distributions in real-time systems

Recent advances in modeling response-time distributions in r...

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作者： Trivedi, Kishor S. Ramani, Srinivasan Fricks, Ricardo Department of Electrical and Computer Engineering Duke University Durham NC 27708-0291 United States Computer Science and Engineering Department Indian Institute of Technology Kanpur 208016 India IBM Corporation Research Triangle Park NC 27709 United States Network Advanced Technology Motorola Inc. Fort Worth TX 76137-2794 United States

Real-time systems are an important class of process control systems that need to respond to events under time constraints, or deadlines. Such systems may also be required to deliver service in spite of hardware or software faults in their components. This fault-tolerant characteristic is especially critical in systems whose failure can cause economic disaster and/or loss of lives. This paper reports recent research in the area of analytical modeling of the three major characteristics of real-time systems: timeliness, dependability, and external environmental dependencies. The paper starts with a brief introduction to analytical modeling frameworks such as Markov models and stochastic petri nets. This is followed by an examination of advances in modeling response-time distributions, reliability, distributed messaging services, and software fault-tolerance in real-time systems. © 2003 IEEE.

关键词： Real time systems

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Priority-based internet access control for fairness improvement and abuse reduction

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2nd International Workshop on Quality of Service in Multiservice IP networks, QoS-IP 2003

作者： Lin, Tsung-Ching Sun, Yeali S. Chang, Shi-Chung Chu, Shao-I. Chou, Yi-Ting Li, Mei-Wen Department of Electrical Engineering National Taiwan University Taipei Taiwan Department of Information Management National Taiwan University Taipei Taiwan Computer and Information Network Center National Taiwan University Taipei Taiwan

ISBN: (纸本)3540006044

In this paper, we exploit a prioritized-service architecture and apply a priority based traffic control scheme to reduce abusive Internet access, improve fairness among users and study users behavior under a prioritized service for Internet access. The Internet access by dormitory users of National Taiwan University (NTU) serves as a conveyer problem. There are two classes of service. The regular class has a volume quota for each user, which is designed to meet majority users essential demands while limiting abusive usage of quality service. The custody class is lower in service priority with no volume quota limitation. Our mathematical models for design and analysis include individual and aggregate user demand models and a network performance model. The priority control scheme is implemented over an existing NTU dormitory network with additions of a QoS router, a meter reading server, an accounting server and a user interface server. The control leads to 48.9% reduction in average packet drop rate, 42.2% improvement in a fairness measure, reduction of abusive Internet access by 57.82% and 145.09% Internet access increase in majority users. Such results are quite consistent with predictions of our mathematical models. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Access control

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