The Timed RBAC

The research work of RBAC is greatly emphasized in recentyears. But the main work focus on some other characters which has nothing to do with thetime character. We describe a RBAC model with time character called TRBAC, in which, weextend the former constraint so that it can describe the time character and we point out somealgorithms to solve state change problem of the time-constraint and the sessions. We alsoanalysis the consistent state of the model and discuss the problem to maintain the consistentstate.