Toward a multilevel secure relational data model
Sushil Jajodia, Ravi S. Sandhu · ACM SIGMOD Record · 1991
Although there are several efforts underway to build multilevel secure relational database management systems, there is no clear consensus regarding what a multilevel secure relational data model exactly is.In part this lack of consensus on fundamental issues reflects the subtleties involved in extending the classical (single-level) relational model to a multilevel environment.Our aim in this paper is to discuss the most fundamental aspects of the multilevel secure relational model.Specifically, we consider two requirements: entit y integrity and update semantics.Our overall goal is to preserve as much as possible the simplicity and flexibility of the relational model without sacrificing security in the process.