Abstract:Based on the analysis of role permission and role hierarchy, an extended role-based access control(RBAC) model?ERBAC is put forward to mend the imperfections of the famous RBAC model.

• 摘要:针对传统的RBAC模型的不足,对角色权限及角色层次关系进行了分析,提出了一个改进的角色访问控制模型??ERBAC;