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Security and Trust Issues in Semantic Grids Olmedilla, Daniel Rana, Omer F. Matthews, Brian Nejdl, Wolfgang Trust Security Policies Safety Reputation VO Lifecycle Grid computing allows sharing of services and resources accross institutions. However, current Grid security mechanisms for authentication and authorization are too rigid and they lack the ability to determine how ``trustworthy'' the result obtained from a specific provider is likely to be. This paper describes the different facets associated to Trust and identifies the need for Trust Management approaches in the context of Virtual Organizations lifecycle and resource access control in the Grid. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Daniel Olmedilla and Omer F. Rana and Brian Matthews and Wolfgang Nejdl 2006 Is Part Of Dagstuhl Seminar Proceedings, Volume 5271, Semantic Grid: The Convergence of Technologies (2005) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.05271.11 urn:nbn:de:0030-drops-4081 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05271.11 eng https://creativecommons.org/licenses/by/4.0/legalcode