摘要： RBAC(Role-Based Access Control)has been the most promising access control policy that is generally acknowledged currently,and becomes one of hot research topics in the area of inrormation.The role grant management in traditional RBAC is only done by syste

关键词: 信息安全 信息系统 计算机 角色 存取控制 动态角色委托代理授权模型