Toward a multilevel secure relational data model
SIGMOD '91 Proceedings of the 1991 ACM SIGMOD international conference on Management of data
Asserting beliefs in MLS relational models
ACM SIGMOD Record
The multilevel relational (MLR) data model
ACM Transactions on Information and System Security (TISSEC)
Belief reasoning in MLS deductive databases
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
Research Directions in Database Security
Research Directions in Database Security
Correctness Criteria for Multilevel Secure Transactions
IEEE Transactions on Knowledge and Data Engineering
IEEE Transactions on Knowledge and Data Engineering
Entity Modeling in the MLS Relational Model
VLDB '92 Proceedings of the 18th International Conference on Very Large Data Bases
Polyinstantation for Cover Stories
ESORICS '92 Proceedings of the Second European Symposium on Research in Computer Security
Cover Stories for Database Security
Results of the IFIP WG 11.3 Workshop on Database Security V: Status and Prospects
International Journal of Electronic Commerce
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There has been an abundance of research within the last couple of decades in the area of multilevel secure (MLS) databases. Recent work in this field deals with the processing of multilevel transactions, expanding the logic of MLS query languages, and utilizing MLS principles within the realm of E-Business. However, there is a basic flaw within the MLS logic, which obstructs the handling of clearance-invariant aggregate queries and physical-entity related queries where some of the information in the database may be gleaned from the outside world. This flaw stands in the way of a more pervasive adoption of MLS models by the developers of practical applications. This paper clearly identifies the cause of this impediment -- the cover story dependence on the value of a user-defined key -- and proposes a practical solution.