一种新型的角色层次化关系模型

分析了现有RBAC模型中角色层次关系的不足，设计了一种新型的角色层次化模型。在该模型中，将角色分为不同的类型，角色所拥有的权限也被分为公开权限、私有权限和继承权限，不同角色类型具有不同的权限继承方式。将角色组织形成层次清晰的树形结构，能够很好地模拟现实生活中的组织机构的层次关系，增强了RBAC中角色的管理能力，提高了授权管理的效率。

New Role Hierarchy Model

A new role hierarchy model is established based on the analysis of existing RBAC model.In the model, the roles are separated into several types. The privileges of roles include three types: public privilege, private privilege and inherited privilege. The mode of privilege inheriting varies with the role type. The roles are organized to form a tree. The role tree can simulate the real enter-prise structure. The new role hierarchy model enhances the administration ability of roles, and im-proves the efficiency of authorization management.