RBAC Model with Multi-Granularities of Time Constraints

In this paper, we establish a dynamic fine-grained access control model by study the multiple granularities of time constraints´ describes and consistency problems, thereby enhancing the access control precision, quality and efficiency. This article describes the related concepts of time and the time constraints of multi-granularity. It proposed a kind of TRBAC model with multiple granularities of time constraints by extending time dimension of the RBAC model. At the same time, it discusses and analyzes the maintenance in the state of system consistency. After introducing the features of time, the ability of system portray authority in reality was enhanced and brings the system with stronger, more comprehensive description of system security capabilities.