Credential trustworthiness-based trust evaluation in grid

Currently, credentials are widely used in attribute/property-based trust establishment. Yet, for the scale and openness of Grid, much uncertainty comes with credentials, such as no globally accepted authority, no guarantee of the consistency between behaviors and claims etc., which is less studied by most credential-based approaches for trust establishment. In this paper we introduce the notion of credential trustworthiness to bring credentials' uncertainty and differentiation to the surface. Using uncertainty-reasoning methods, we give the evaluation of an entity's trustworthiness with one single credential involved and multiple credentials involved respectively.