Research On Trust Evaluation In Grid Authorization Management

In this paper, the application of trust evaluation in grid authorization management is studied. Firstly, the paper gives a grid trust evaluation model based on fuzzy theory which evaluates trust value with the method of fuzzy comprehensive evaluation, achieving the multi-factor synthetic evaluation of entity trust. Then, by studying the application of trust value in grid authorization and access control mechanism, the paper presents a trust level ranking model based on fuzzy cluster analysis and a grid authorization model based on entities'trust level, in which trust value plays an important role in grid authorization process. On the basis of the study above, a multi-layer authorization model in virtual organization VO is given, with the issues of coalition between virtual organizations illustrated. Finally, the paper gives simulations of the trust-based grid authorization model, applies the model to power grid, and designs the trust-based authorization model in power grid.