Research on Turn Time Point and Security Recover in Timed Role-based Access Control

Based on the analysis of time-constraint role-based access control model,the problems of choosing the turn time point and security status recovery are explained,and the algorithms of choosing the turn time point which can judge the system security status in TRBAC and choosing the reasonable teminating session set which will restore the system are proposed.Therefore,the algorithm solves the conflict,to some extent,between efficiency and security caused by when the turn time point choosing is too big or too small.