A Trust Evaluation Model for Dynamic Authorization

The traditional access control model is not appropriate to do dynamic authorization when there are changes of trust value, organizational structure, attribute of the subject, time strategy, task or process and so on. In this condition, we need a dynamic authorization model according to these changes. The change of trust value is an important factor to do dynamic authorization in dynamic federation environment. This thesis gives a description of concept of trust, trust evaluation, dynamic authorization and proposes a trust evaluation model which can provide good support for dynamic authorization in federate environment.