Access Control Based on Graded Roles

Combining with RBAC model,a graded roles based access control model is put forward.System users are divided into different kinds of roles by their functions,and one kind of roles are divided into different grades.Basic concepts and the grade-role matrix are defined,the model is described formaly and applied to practical systems.Real users are corresponding to different access authorization sources through different graded roles,the role conversion and grade variance can be dynamically completed,so the access control mechanism becomes more flexible.