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A Stateful Web Service Firewall for BPEL

A Stateful Web Service Firewall for BPEL

引用

IEEE International Conference on Web Services (ICWS)

作者： Nils Gruschka Meiko Jensen Norbert Luttenberger Communication Systems Research Group Department for Computer Science Christian-Albrechts University Germany

Today, the Business Process Execution Language (BPEL) is the most emerging specification for Web Service Composition, which is an important part of the SOA paradigm. Defining a stateful communication protocol, BPEL enables potential for new security vulnerabilities. In this paper, we present a severe Denial-of-Service attack on a leading BPEL engine, illustrating new threats on availability in the context of BPEL. Derived from our observations, we developed a protection concept and implemented an application level firewall fending these types of attacks.

关键词： Web services computer crime Service oriented architecture Protection Access protocols Business communication Search engines Security Availability Web server

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SOA and Web Services: New Technologies, New Standards - New Attacks

SOA and Web Services: New Technologies, New Standards - New ...

引用

European Conference on Web Services (ECOWS)

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

Being regarded as the new paradigm for Internet communication, Web Services have introduced a large number of new standards and technologies. Though founding on decades of networking experience, Web Services are not more resistant to security attacks than other open network systems. Quite the opposite is true: Web Services are exposed to attacks well-known from common Internet protocols and additionally to new kinds of attacks targeting Web Services in particular. Along with their severe impact, most of these attacks can be performed with minimum effort from the attacker's side. In this paper we present a list of vulnerabilities in the context of Web Services. To proof the practical relevance of the threats, we performed exemplary attacks on widespread Web Service implementations. Further, general countermeasures for prevention and mitigation of such attacks are discussed.

关键词： Service oriented architecture Web services Cryptography XML Security Simple object access protocol computer crime communication standards Web and internet services Transportation

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Access Control Enforcement for Web Services by Event-Based Security Token Processing

Access Control Enforcement for Web Services by Event-Based S...

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communication in distributed systems - 15. ITG/GI Symposium

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

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.

关键词： Lead Ions Authentication Authorization

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Visualisation of Network Traffic using Dynamic Co-occurrence Matrices

Visualisation of Network Traffic using Dynamic Co-occurrence...

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International Conference on Internet Monitoring and Protection, ICIMP

作者： Thorsten Kisner Alex Essoh Firoz Kaderali Department of Communication Systems Faculty of Mathematics and Computer Science Fern Universität Hagen Germany

Traffic visualisation is important in several areas e.g. network planning and monitoring, network traffic analysis and intrusion detection. A novelty in the work we present in this paper is the use of texture analysis methods from the domain of digital image processing for network traffic visualisation. We use strategies based on co-occurrence matrices to derive statistical properties for network traffic visualisation and anomalous traffic detection. Based on the fact that some of the statistical properties are related to a certain kind of traffic, which is also reflected in the allocation of the dynamic co-occurrence matrix, we are able to display the global status of our network and show periods, where the traffic behaviour is unusual. Further, we introduce a new parameter, network traffic homogeneity (NTH) as a measure of the local roughness of the network traffic.

关键词： Telecommunication traffic Intrusion detection Image texture analysis communication system security Humans Data visualization Displays Digital images Application software Information analysis

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A new rough set reduct algorithm based on particle swarm optimization

A new rough set reduct algorithm based on particle swarm opt...

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2nd International Work-Conference on the Interplay Between Natural and Artificial Computation, IWINAC 2007

作者： Yue, Benxian Yao, Weihong Abraham, Ajith Teng, Hongfei Liu, Hongbo Department of Computer Dalian University of Technology Dalian 116023 China School of Mechanical and Engineeing Dalian Universityof Technology Dalian 116023 China Centre for Quantifiable Quality of Service in Communication Systems Norwegian University of Science and Technology Trondheim Norway School of Computer Science Dalian Maritime University Dalian 116026 China

ISBN: (纸本)3540730524

Finding appropriate features is one of the key problems in the increasing applications of rough set theory, which is also one of the bottlenecks of the rough set methodology. Particle Swarm Optimization (PSO) is particularly attractive for this challenging problem. In this paper, we attempt to solve the problem using a particle swarm optimization approach. The proposed approach discover the best feature combinations in an efficient way to observe the change of positive region as the particles proceed through the search space. We evaluate the performance of the proposed PSO algorithm with Genetic Algorithm (GA). Empirical results indicate that the proposed algorithm could be an ideal approach for solving the feature reduction problem when other algorithms failed to give a better solution. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Particle swarm optimization (PSO)

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An open-source platform for IP telephony services

An open-source platform for IP telephony services

引用

International Conference on Software, Telecommunications and computer Networks (SoftCOM)

作者： Luca Veltri Cosimo Fadda Department of Information Engineering University of Parma Italy Department of Computer Communication and Systems Science University of Genova Italy

The success of modern VoIP-based applications has demonstrated how VoIP technologies are rather mature for replacing current telephony systems and for creating new and flexible modes of communication. Currently there are many open-source libraries, tools, and applications available. Starting from some of them, we have designed and built a complete IP telephony platform including several functionalities such registration, call proxying, authentication, PSTN interworking, conferencing, voice mail and other centrex functions. The core of our platform is based on our java-based SIP proxy implementation named mj Proxy that is also described in the paper.

关键词： Open source software Internet telephony Protocols computer architecture Voice mail Application software Authentication Java Web server Libraries

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Distance-Optimal Oversaturated CDMA Signature Ensemble

Distance-Optimal Oversaturated CDMA Signature Ensemble

引用

International Symposium on Wireless communication systems (ISWCS)

作者： Jarkko Paavola Valery Ipatov TUCS Turku Centre for Computer Science Department of Information Technology Communication Systems University of Turku Finland

A method of increasing the capacity of synchronous DS-CDMA beyond the signal space dimension is called oversaturation. When the number of users exceeds the signal space dimension, it does not in principle prohibit the maximization of minimum Euclidean distance between the points of a group signal constellation up to the optimum achieved with orthogonal users' signatures. Previously reported construction of distance-optimal signature ensembles was limited to only signal space dimensions equal to the natural power of four. This paper presents a generalization of such a method to arbitrary signal space dimensions. Necessary condition of presenting binary antipodal alphabet in the oversaturated ensembles of this kind is also discussed.

关键词： Multiaccess communication Downlink Multiple access interference Signal processing Space technology Wireless communication Frequency synchronization 3G mobile communication Time division multiplexing Bandwidth

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Light-weight End-to-End QoS as DoS Prevention

Light-weight End-to-End QoS as DoS Prevention

引用

Conference on Local computer Networks (LCN)

作者： Marcel Waldvogel Tobias Kock Zurich Research Laboratory IBM Research USA Distributed Systems Laboratory Department of Computer and Information Science University of Konstanz Konstanz Germany

This paper proposes a first step into a common solution, where combined and extended interests will hopefully allow us to surpass this threshold. While there are still some open issues, we hope to not only propose a basic working mechanism but also provide fresh ideas to start thinking off the beaten path. Our main contribution is to create a lightweight, end-to-end binding between path and service, which is then used as a basis to associate further attributes and mechanisms to this binding.

关键词： Quality of service computer crime Proposals Laboratories Cryptography computer networks Electric shock Signal processing Customer satisfaction distributed computing

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Transmission protocols for challenging networks: LTP and LTP-T

Transmission protocols for challenging networks: LTP and LTP...

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International Workshop on Satellite and Space communications (IWSSC)

作者： Fahad Syed Muhammad Laurent Franck Stephen Farrell Communication Propagation and Radar IETR National Institute for Applied Sciences Rennes France Microwaves Department ENST de bretagne Toulouse France Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

Challenging networks require transmission protocols able to deal with the specificities of the environment. These adverse conditions include very long delays (delays in hours are normal), episodic connectivity, asymmetric data rates, higher bit error rate (The raw BERs are in the order of 10 -2 ), very high free space losses (around 250-300 dB) and power constraints that may severely compromise the effectiveness of standard transport protocols. Transmissions protocols must also relieve applications and other upper-layer protocols (like the bundle protocol from the Delay Tolerant Network architecture) from the need to deal with the characteristics of intervening communications networks and services. In this paper we analyse the impacts of parameters such as loss probability and propagation delay on Licklider Transmission Protocol (LTP) [1], [2] and the newly proposed Licklider Transmission Protocol-(LTP-T) [3] following a comparative study of both the protocols.

关键词： Propagation delay Bit error rate Propagation losses Earth Mars Delay effects Transport protocols Disruption tolerant networking communication standards IP networks

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Dynamic Service Scheduling for Workflow Applications in Service Oriented Grid

Dynamic Service Scheduling for Workflow Applications in Serv...

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2007年第三届语义和知识网格国际会议(Third International Conference on Semantics,Knowledge,and Grid)(SKG 2007)

作者： JongHyuk Lee SungHo Chin SeongJin Song HeonChang Yu Byungkwen Song Distributed & Grid Computing Lab Department of Computer Science Education Korea University Anam-d Dept. of Information and Communication Seokyeong University Korea

In the Service Oriented Grid, a grid application can be composed of diverse Grid Services which may be already deployed on grid sites, and dependencies between these Grid Services can be described as the workflow graph. Though many grid scheduling methods have been developed, they have been studied based on static heterogeneous computing environment. For this reason, these heuristics cannot be directly applied to Grid, which is more dynamic computing environment. Therefore, we develop the dynamic service scheduling method, which support that the workflow applications can be performed effectively in spite of dynamic Grid nature. Lastly, we show that our proposed scheduling method outperforms than other conventional scheduling methods through the various experiments.

关键词： Dynamic scheduling Processor scheduling Grid computing Scheduling algorithm Monitoring Application software Web services Information management computer science education Environmental management

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