Toward a multilevel secure relational data model

Abstract

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: entity 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. 1 INTRODUCTION A large number of databases in the Department of Defense, the intelligence community and civilian government agencies contain data that are classified to have different security levels. All database users are also assigned security clearances. It is the respo...

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