改进的多级安全模型的设计与实现

Design and implementation of improved multiple-level security model

在分析BLP模型和RBAC模型及其相关衍生模型的基础上,提出一种改进的模型。改进模型主要有4个重要特点:(1)实施完整性控制,保证信息流上写安全性;(2)限定可信主体,赋予其余主体有限特权;(3)实施RBAC模型,分配角色和权限;(4)引入审计机制,提供策略监控。实验结果表明,改进后的模型在完善安全性的同时提高了实用性。

On the basis of the BLP model and RBAC model,a new improved multiple-level model is presented.The improved model has four important features：（1）carry out the control of integrity;（2）constrain the trusted subject and limit the right of other subjects;（3）realize RBAC model to assign the role and the permission;（4）fulfill the audit mechanism rules to monitor the security policy.Experimental results show that the improved model increases security and the usability.