Polyinstantiation in Relational Databases with Multilevel Security

Polyinstantiation provides the ability to create more versions of single information. It is used to prevent inference attacks. This paper explains the use of polyinstantiation in relational databases with multilevel security for implementing e.g. cover stories. It describes common methods of access controls in relational databases and describes multilevel relational databases. This paper also shows how polyinstantiation can be implemented and what types of architecture support it.