An Algebra for Belief Persistence in Multilevel Security Databases

摘要: In a multilevel security environment, the levels form hierarchy which is generally assumed to be lattice. A user can see not only its own information, but also information belonging lower users. database, different users have beliefs (versions of information) about same real world object. this paper we present relational model SecDB for data. We an SQL-like language SecSQL querying information. For given level, tuple consists all differing Therefore, provides built-in coherence operator well defined, application should preserve and coherence. This persistence belief achieved through concept anchor borrowed from earlier work. On one hand (in addition usual database queries) yields itself naturally formulation related queries, yet on other algebraic operators yield natural identities hold good promise optimization.