Recognizing the Immediacy of Roles in NTree Based on Matrices

There are many benefits for providing access control with roles of users rather than individuals as the unit of granularity. The benefits are enhanced in the RBAC partial order. It is a natural and systematic approach that roles are organized in NTree. In this paper, the matrix representation of a partial order is defined. An algorithm for recognizing immediacy in partial order is introduced. The representation and the algorithm are applied to NTree.