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Negotiating Trust on the Grid Basney, Jim Nejdl, Wolfgang Olmedilla, Daniel Welch, Von Winslett, Marianne Trust policy negotiation Grids support dynamically evolving collections of resources and users, usually spanning multiple administrative domains. The dynamic and crossorganizational aspects of Grids introduce challenging management and policy issues for controlling access to Grid resources. In this paper we show how to extend the Grid Security Infrastructure to provide better support for the dynamic and cross-organizational aspects of Grid activities, by adding facilities for dynamic establishment of trust between parties. We present the PeerTrust language for access control policies, which is based on guarded distributed logic programs, and show how to use PeerTrust to model common Grid trust needs. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Jim Basney and Wolfgang Nejdl and Daniel Olmedilla and Von Welch and Marianne Winslett 2005 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.05271.7 urn:nbn:de:0030-drops-3872 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05271.7 eng https://creativecommons.org/licenses/by/4.0/legalcode