Research of Trust Valuation and Decision-making Based on Cloud Model in Grid Environment

In general, present trust evaluation models in grid environment fail to adequately consider the fuzzy characteristic of trust relation efficiency, and the description of trust by these models lacks comprehensiveness.To solve these problems, trust cloud concept and a trust evaluation model based on it were proposed.In this model, trust information was picked up through entities' satisfaction degree of collaboration in the grid, so it could accurately describe trust expectation value.The uncertainty was portrayed through entropy and hyper entropy in this model, which made the evaluation process more consistent with trust semantic meaning.Algorithms of cloud similarity measurement and decision-making method through trust cloud were proposed.Experiment proves that the trust relation described by trust cloud can be used as foundation for decision-making on security in grid environment.