动态推理控制

Dynamic Inference Control

防止未授权的用户从可读取的安全等级较低的数据中推理出安全等级较高的数据是多级关系数据库达到安全的必要保证。由于数据库中元组、属性、元素之间的相互关联性,多级关系数据库存在着推理通道。它的存在对信息的安全造成很大威胁。主要论述了多级安全数据库系统的推理通道的来源,分析了目前在多级安全数据库系统中推理问题的成果。在此基础上,提出了一种动态控制推理通道的方法并给出了相应算法。

Preventing unauthorized users from inferring higher level data from the authorized lower level data is the necessary assurance of the security of the database. Because of the relationship among the tuples, the attributes and the elements,inference becomes an important problem of the secure database. The existence of it brings hidden troubles of the information security. Mainly discusses how the inference channel comes from and analyses the method for handling this problem now. Brings forward a dynamic method and gives the algorithm.