一种新的协同设计环境中访问控制模型研究

通过对现有访问控制方法的研究，针对其中的不足和协同设计环境中对访问控制的特殊要求，提出了一个新模型RTBAC。该模型综合了基于任务的访问控制（TBAC）和基于角色的访问控制（RBAC）模型，从而将静态访问控制和动态访问控制相结合，并在此基础上引入了用户委托。系统基于B／S架构满足了计算机支持的协同设计（CSCD）系统的需求；引入权限加减机制，弥补了控制粒度过大的问题；通过矩阵计算和验证状态加快了访问和协同设计的速度。研究结果表明，提出的新模型可加快协同访问控制速度，增强协同访问控制的安全性和有效性。

Study of new access control model in cooperative design environment

A research on the existing access control method has been made.Aiming at its weakness and special request of access control in cooperation design environment,a new model RTBAC was proposed.The task based access control(TBAC) and role based access control(RBAC) models were synthesized to combine the static state access control with the dynamic access control.The user's request was introduced and the system was based on the B/S construction,the demand of the computer supported cooperative design(CSCD) system ...