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8th Australasian Conference on Information Security and Privacy, ACISP 2003

作者： Bull, Laurence Squire, David McG. Newmarch, Jan Zheng, Yuliang School of Computer Science and Software Engineering Monash University Caulfield East 3145 Australia School of Network Computing Monash University Frankston 3199 Australia Department of Software and Information Systems University of North Carolina at Charlotte Charlotte NC 28223 United States

ISBN: (纸本)3540405151

This paper addresses the issue of selective disclosure of verifiable content. It extends previous work relating to Content Extraction Signatures [21] to implement a more complex structure that encodes a richer, more flexible fragment extraction policy, which includes fragment grouping. The new extraction policy enables the signer to specify both optional and mandatory fragment associations (or groupings) for verifying extracted content. © 2003 Springer-Verlag Berlin Heidelberg.

关键词： Extraction

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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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IEEE Conference on Vehicular Technology (VTC)

作者： C.A. Barnett K.J. Ray Liu Hughes Network Systems Germantown MD USA Electrical and Computer Engineering Department University of Maryland College Park USA

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.

关键词： Communication system security Synchronization Stochastic resonance Time measurement Noise reduction Mobile computing Delay effects Noise measurement Quality of service computer applications

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Developing a heterogeneous intrusion tolerant CORBA system

Developing a heterogeneous intrusion tolerant CORBA system

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Foundations of Intrusion Tolerant systems, OASIS 2003

作者： Sames, David Matt, Brian Niebuhr, Brian Tally, Gregg Whitmore, Brent Bakken, David Distributed Systems Security Department NAI Labs. - Network Associates Inc. 3060 Washington Road GlenwoodMD21738 United States School of Electrical Engineering and Computer Science Washington State University PO Box 642752 PullmanWA99164-2752 United States

ISBN: (纸本)076952057X

Intrusion Tolerant systems provide high-integrity and high-availability services to their clients in the face of successful attacks from an adversary. The Intrusion Tolerant Distributed Object systems (ITDOS) research project1 is developing an architecture for a heterogeneous intrusion tolerant distributed object system. ITDOS integrates a Byzantine Fault Tolerant multicast protocol into an open-source CORBA ORB to provide Intrusion Tolerant middleware. This foundation allows up to f simultaneous Byzantine failures of replicated servers in a system of at least 3f+1 replicas. Voting on unmarshalled CORBA messages allows heterogeneous application implementations for a given service, allowing for greater diversity in implementation and greater survivability. Symmetric encryption session keys generated by distributed pseudo-random function techniques provide confidential client-server communications. This paper overviews the ITDOS architecture, discusses some of the challenging technical issues related to intrusion tolerance in heterogeneous middleware systems, and offers views on future areas of work. © 2003 IEEE.

关键词： Common object request broker architecture (CORBA)

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Length reduction of evanescent-mode ridge waveguide bandpass filters

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Progress in Electromagnetics Research 2003年 40卷 71-90页

作者： Shen, T. Zaki, K.A. Advanced Development Group Hughes Network Systems Germantown MD 20876 United States Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 United States

Length reduction of evanescent-mode ridge waveguide bandpass filters is investigated extensively. Based on the conventional filter configuration, two new filter configurations are proposed: one is the generalized filter, and the other is the folded filter. In the generalized filter configuration, the cross sections of the evanescent waveguide and the ridge waveguide are not necessarily the same. It is found that the filter length can be reduced by enlarging the evanescent waveguide height. In the folded filter configuration, the filter is folded back at the middle coupling section. The folded junction is ridged to provide the required coupling between the two ridge waveguide resonators it connects. A design example demonstrates the feasibility of this filter configuration.

关键词： Ridge waveguides

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Software configuration management related to the management of distributed systems and service-oriented architectures

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 2649卷 54-69页

作者： Tosic, Vladimir Mennie, David Pagurek, Bernard Network Management and Artificial Intelligence Lab. Department of Systems and Computer Engineering Carleton University 1125 Colonel By Drive Ottawa Ont. K1S 5B6 Canada

We summarize our three research projects related to software configuration management and discuss three challenges for the future research in software configuration management. The three projects that we discuss are dynamic service composition from service components, extending service components with multiple classes of service and mechanisms for their manipulation, and dynamic evolution of network management software. The three challenges to software configuration management research that we are interested in are: I) managing dynamism and run-time change, 2) integration of software configuration management with other management areas and domains, and 3) management of Web Service compositions. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Information services

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Developing a heterogeneous intrusion tolerant CORBA system

Developing a heterogeneous intrusion tolerant CORBA system

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Foundations of Intrusion Tolerant systems

作者： D. Sames B. Matt B. Niebuhr G. Tally B. Whitmore D. Bakken Distributed Systems Security Department NAI Laboratories-Network Associates Inc. Glenwood MD USA School of Electrical Engineering and Computer Science Washington State University Pullman WA USA

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Efficient Approach for Face Detection in Video Surveillance

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Journal of Donghua University(English Edition) 2003年第4期20卷 52-55页

作者：宋红石峰 Department of Computer Science and Engineering Beijing Institute of Technology Beijing 100081 China Department of Computer Science and Engineering Beijing Institute of Technology Beijing 100081 Chinaecurity access control systems and automatic video surveillance systems are becoming increasingly important recently and detecting human faces is one of the indispensable processes. In this paper an approach is presented to detect faces in video surveillance. Firstly both the skin-color and motion components are applied to extract skin-like regions. The skin-color segmentation algorithm is based on the BPNN (back-error-propagation neural network) and the motion component is obtained with frame difference algorithm. Secondly the image is clustered into separated face candidates by using the region growing technique. Finally the face candidates are further verified by the rule-based algorithm. Experiment results demonstrate that both the accuracy and processing speed are very promising and the approach can be applied for the practical use.

Security access control systems and automatic video surveillance systems are becoming increasingly important recently,and detecting human faces is one of the indispensable *** this paper,an approach is presented to detect faces in video ***,both the skin-color and motion components are applied to extract skin-like *** skin-color segmentation algorithm is based on the BPNN (back-error-propagation neural network) and the motion component is obtained with frame difference ***,the image is clustered into separated face candidates by using the region growing ***,the face candidates are further verified by the rule-based *** results demonstrate that both the accuracy and processing speed are very promising and the approach can be applied for the practical use.

关键词： face detection skin-color segmentation BPNN frame difference region growing

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A Novel, User-Level, Security-On-Demand Paradigm for ATM networks: Modeling, Simulation, and Performance Analysis

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Journal of Interconnection networks 2003年第4期4卷 429-461页

作者： H. J. (Jerry) Schumacher Tony Lee Sumit Ghosh Department of EE & CS US Military Academy West Point New York 10996 USA Vitria Technology 945 Stewart Drive Sunnyvvale CA 94086 USA Secure Network Systems Design Lab. Department of Electrical & Computer Engineering Stevens Institute of Technology Hoboken NJ07030 USA

With networks increasingly moving into virtually every aspect of our daily life, security is gaining importance, not only from the traditional perspective of communication but the network's growing role in modern automation and control. The traditional, certification based approach attempts to guarantee the security of a network through certification. Certified networks are generally confined to a limited domain and, as a result, they are isolated, costly, and under-utilized. In contrast, this paper presents a new principle – user-level, security-on-demand system, wherein the network allocates, where possible, the security resources commensurate with the user's request for transporting message(s) through the network securely. This principle is successfully demonstrated for the current Asynchronous Transfer Mode (ATM) networks, and is the result of an integration of the fundamental framework for network security, recently proposed by the authors in the literature, with the unique characteristics of ATM networks. The framework encapsulates the fundamental knowledge and set of relationships in network security and permits scientific and systematic reasoning about network security. It also enables all user groups – military, government, industry, and academia, to define their security requirements in a uniform manner. The security-on-demand approach promises the development of a "mixed use" class of networks in the future that may be simultaneously shared by different groups of users, with the system sustaining the diverse security requirements of each user. A unique characteristic in ATM network design is the dynamic call setup process. Under it, a network first establishes a virtual path or route for a user's call, guided by the user's requirements, and then transports the messages when a route has been successfully determined. This unique ATM characteristic is integrated with the framework to yield a successful demonstration of the proposed, user-level, security-on-d

关键词： network security security metric network security performance security-on-demand distributed resources allocation ATM network total security modeling simulation

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Automatically detecting and visualising errors in UML diagrams

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Requirements engineering 2002年第4期7卷 264-287页

作者： Campbell, Laura A. Cheng, Betty H. C. McUmber, William E. Stirewalt, R.E.K. Department of Computer Science and Engineering Michigan State University East Lansing MI United States Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI 48824 United States

UML has become the de facto standard for object-oriented modelling. Currently, UML comprises several different notations with no formal semantics attached to the individual diagrams or their integration, thus preventing rigorous analysis of the diagrams. Previously, we developed a formalisation framework that attaches formal semantics to a subset of UML diagrams used to model embedded systems. This paper describes automated structural and behavioural analyses applicable to UML diagrams using our formalisation framework. In addition to intra- and inter-diagram consistency checks, we discuss how simulation and model checking can be used in tandem for behavioural analysis of the UML diagrams. Our tools also visually interpret the analysis results in terms of the original UML diagrams, thereby facilitating their correction and refinement. We illustrate these capabilities through the modelling and analysis of UML diagrams for an automotive industrial case study. © 2002 Springer-Verlag London Limited.

关键词： Formal specifications Model checking Simulation UML

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Symbol-by-symbol and trellis-based equalization with widely linear processing for space-time block-coded transmission over frequency-selective fading channels

Symbol-by-symbol and trellis-based equalization with widely ...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： W.H. Gerstacker F. Obernosterer R. Schober A. Lehmann A. Lampe P. Gunreben Universitat Erlangen-Niimb Germany Lucent Technologies Network Systems GmbH Nürnberg Department of Electrical and Computer Engineering University of Toronto Canada Department of Electrical and Computer Engineering Lucent Technologies Network Systems GmbH Nürnberg Germany

In this paper, we develop receiver concepts for transmission with space-time block codes (STBC) over frequency-selective fading channels. The focus lies on Alamouti's STBC, but the results may be generalized to related STBC. We show that a straightforward combination of conventional equalizers and a space-time block decoder is only possible if at least as many receive antennas as transmit antennas are employed, but not for the practically interesting case of pure transmit diversity. This restriction is circumvented by our approach. Equalizers with widely linear (WL) processing are designed, utilizing the structural properties of the transmit signal of space-time block coding, which is shown to be improper (rotationally variant). These schemes are especially suited for equalization of high-level modulated signals, which are used in third-generation time-division multiple access mobile communications standards such as EDGE (Enhanced Data Rates for GSM Evolution).

关键词： Frequency-selective fading channels Block codes Equalizers Receiving antennas Decoding Transmitting antennas Process design Signal design Signal processing Mobile communication

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