基于时限BLP模型的XML文档访问控制研究

摘要

IEBLP model has a deficiency that security level of object is changeless in the whole life cycle.The TBLP with time limited element is proposed to solve the deficiency.Time limited element is added into the security labels of subject and object,and its safety justices are improved.Finally,an Mandatory Access Control(MAC) model with TBLP for XML documents is realized by using XACML.%针对IEBLP模型中客体安全等级在整个寿命周期中固定不变的不足,提出了一种添加了时间限制元素的TBLP模型,主要在主客体安全标签中加入了时间限制元素,并对其安全公理进行了相对应的改进.最后,利用XACML实现了TBLP模型对XML文档的强制访问控制.