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We extend Controlled Query Evaluation (CQE), an inference control method to enforce confidentiality in static information systems… Expand An important goal of security in information systems is confidentiality. A confidentiality policy specifies which users should be… Expand Polyinstantiation is the situation where multiple records sharing the same identifier value occur in one table. Multi-level… Expand A multilevel relational database represents information in a multilevel state of the world, which is the knowledge of the truth… Expand This paper proposes a taxonomy for secure object-oriented databases in order to clarify the issues in modeling and implementing… Expand Abstract : Polyinstantiation has generated a great deal of controversy lately. Some have argued that polyinstantiation and… Expand Polyinstantiation is a phenomenon of multilevel data. As such, it exists as a property of information and is not merely the… Expand Polyinstantiation has generated a great deal of controversy in the multilevel secure (MLS) database management system (DBMS… Expand Polyinstantiation integrity (PI) as defined in the Sea View multilevel relational data model consists of a functional dependency… Expand A new polyinstantiation integrity constraint for multilevel relations based on the intuitive idea that every entity in a relation… Expand