Research of TRBAC model and the application in library management

Access control is an important part of the information system security in life, but traditional models can not meet the changeful information requirements, so the paper proposes task-Role-based Access Control Model TRBAC to meet the rapid development of science and technology in the Library Information Management System's needs. The model solves the shortcomings that flexibility of role-based access control model RBAC is not enough, and enhances the system security through time constraints, the minimum privilege constraints and separation of duties constraints. At last, it detailed the application of TRBAC model in library management for example.