TRDM-Temporal Role-Based Delegation Model

It’s the system manager with authorization role who handles assignments of users to roles in role-based systems. However,the central management,which fully depends on the manager,isn’t suitable for distributed environments. Role-based delegation model （RDM） is more suitable for distributed environments. But current role-based delegation models don’t support temporal delegation and delegation width. A temporal role-based delegation model called TRDM is presented,which is an extension of RDM2000 by supporting temporal delegation and delegation width. New mechanisms of role delegation and role revocation are explored,which is based on TRDM.