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Grid computing system is the one where individual entities share their resources with others in their own domain as well as with other domain. The resources should be shared with out loosing individual's confidentiality and control over their resources. The resources must be selected in such a way to achieve this and at the same time grid security also must be ensured. Various models have been proposed and one of them is the trust model. Reputation based trust models are coming up to address the problems in behavior conformity. The reputation values in these models are evaluated in a democratic manner based upon the feedback from other entities. This paper investigates different reputation based trust models in the presence of malicious entities which give deliberately wrong feedbacks. We propose an efficient model for resource selection which enhances the behavioral conformity in the presence of malicious entities.