Abstract: In this paper，a method of dynamically document access control based on analysis of the information flow is introduced，which builds on the traditional document access control methods and combines the methodology of graph theory.The algorithms of this method first analyze document information flow dynamically，and then find out the potential approach that leads the leak of information.Consequently，some measures can be taken to prevent it from happening，so that the document content can be protected.Also，there are particular descriptions，analysis and validation for the algorithms via simulating a classic scene.

Key words: electronic documents, access control, information flow

摘要： 提出一种基于信息流分析的文档动态访问控制方法，其核心是防止隐性信息泄露的非法信息流检测算法。算法在传统文档访问控制方法的基础上，结合图论的理论方法，通过对文档信息流的动态分析，找出潜在的信息泄漏的可能途径，进而采取相应的措施防止信息泄漏的发生，从而达到对文档内容保护的目的。以一个典型的场景为例进行模拟，对算法进行了详细的描述，分析和验证。

关键词: 电子文档, 访问控制, 信息流