A Grid Authorization Mechanism with Dynamic Role Based on Trust Model ?

Because of the disadvantages of RBAC authorization mechanism in grid, paper designed a grid authorization model with dynamic role based on trust model and workflow management system. The mechanism is service-oriented and service is the access control object. Subject accessing services is under control of workflow management system. Trust Value Database records trust value of services after each invoking and update trust value of subject who owns these services. Subject’s role can vary with the variety of trust value. This policy encourages user in grid provide honest services. Simulation shows that the mechanism can increase the rate of success interaction and restrain dishonest subject as well as their services.

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