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Grid resources and security issues go hand in hand in the success of any Grid application. The present research is moving towards achieving a secured architecture for resource management in Grid System, thereby allowing grid resource to enter the commercial area, where the gird resource cannot be accessed through grid service without the assurance of a higher degree of trust relationship of resource provider. In this paper, we present a secured grid resource management for global grids by addition of a trust-based layer. The Trust and Reputation Models used in P2P environment can be implemented in grid environment with few modifications. In our approach we have implemented PeerTrust model in grid environment with few changes.