This thesis demonstrates how security can be provided in dynamic Virtual Organizations (dVOs) for enabling transient collaborations. The problem associated with the provision of security in dVOs is the absence of trust relationships among prospective dVO partners who are potentially strangers. The traditional methods of providing security in a distributed setting and the existing dVO security approaches are inadequate mechanisms in open environments where dVOs prevail. This has led to the use of alternative technologies. In this thesis use of the Trust Management technique that is based on the notion of trust and reputation has been advocated as available jn the social system. So far numerous studies on the formalization of social phenomenon of trust and reputation have been carried out in different environments e.g. P2P (peer-to-Peer), MANET (Mobile Ad-hoc Networks), pervasive computing. However, very little is known about building an architecture for Trust Management in scalable environments such as dVOs. Hence the main emphasis in this thesis has been to establish mechanisms for Trust Management at a global level and to carry out a study of their behaviour in a practical setting. In order to perform the above-mentioned task, there are a number of issues involved which include: handling the problem of naming and identities, devising innovative strategies for trust data placement, establishing reputation and making it available in an efficient way, devising a mechanism for trust assessments that incorporates different parameters through the use of policy management techniques in different collaboration scenarios and the investigation of the phenomenon of reputation evolution. For investigating the above issues, Object-Oriented Analysis and Design (OOAD) methodology has been followed (with some extensions for service modelling) using the Unified Modelling Language CUML). The solution provides a Web Services based Trust Management Framework (TMF) comprising scalable architecture for trust data dissemination and models for trust and reputation to address the above-mentioned issues. In order to validate the hypothesis the evaluation of the proposed system has been carried out in terms of building initial relationships among prospective dVO partners. It was deduced from the above study that the Trust Management Framework (TMF) as proposed in this thesis could improve security in a dVO environment.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:573386 |
| Date | January 2008 |
| Creators | Hassan, Mohammad Waseem |
| Publisher | University of the West of England, Bristol |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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