In: Database Security, Status and Prospects. Results of the Third IFIP WG 11 3 Workshop, 1989, Monterey, USA, pages 75-96. Amsterdam: North-Holland, 1990.
Abstract: In a multilevel secure database system every entity described by a query should have a security classification. Since every query in a database can be described by a relational algebra, one would like to have a security algebra to `compute' the security classification. One of the main goals of this paper is to develop such an security algebra. The authors introduce a new security model GIFM (generalized information flow model), classify the authorization according to the complexity of the automation of the authorization and apply it to database systems.
Keywords: security algebra; relational algebra; security classification; information flow model, (generalized); authorization classification; database system.