Summary
The paper describes a new approach for treatment security issues in reconfigurable grids used for computing or communication, in particular, in the semantic web environment. The proposed strategy combines a convenient mathematical model, efficient combinatorial algorithms which are robust with respect to changes in the grid structure, and an efficient implementation. The mathematical model uses properties of weighted hypergraphs. Model flexibility enables to describe basic security relations between the nodes such that these relations are preserved under frequent changes in connections of the hypergraph nodes. The algorithms support construction of a grid with embedded security concepts on a given set of nodes. The proposed implementation makes use of the techniques developed for time and space-critical applications in numerical linear algebra. Our combination of the mentioned combined building blocks is targeted to the emerging field of the semantic web, where the security seems to be very important. Nevertheless, the ideas can be generalized to other concepts describable by weighted hypergraphs. The paper concentrates on explaining the model and the algorithms for the chosen application. The consistency of the proposed ideas for security management in the changing grid was verified in a couple of tests with our pilot implementation SECGRID.
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Extract
Secure Grid-Based Computing with Social-Network Based Trust Management in the Semantic Web
1. Introduction
It is widely believed that the Semantic Web can be the successor of the current web. Its main idea is to describe resources in the form of machine processable met a- data allowing automation of the requested tasks connected with the retrieval and usage of these resources. Although the main focus of the previous work was aimed at the creation of knowledge representation languages (RDF-S, DAML+OIL [1], OWL [2]), reasoning systems, and also at the tools helping to embed web pages with semantic markup, the emerging commercial applications such as e- commerce, banking or travel services face a lot of security issues. Without a secure solution, it would be very hard to exploit all promising features of semantic web vision. The first possible approach is to extend the current security mechanisms used in distributed systems (Kerberos, PGP, SPKI etc.). These technologies, however, cannot be seamlessly transferred due to the fully decentralized nature of the web, an extremely large number of resources, services, agents and users, and their heterogeneity. Moreover, the number of entities accessing sources and interacting with themselves can be very large as well and can rapidly change.Let us have a quick look at the Grid computing (communication). It can be characterized by a la...See the full content of this document
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