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An approach is presented that addresses the problem of protecting deductive databases from unauthorized disclosures of the information they contain. Our treatment of this problem involves rewriting a database in a form that is guaranteed to allow users to access only the subset of the logical consequences of the database that they are authorized to see. Security requirements can be seamlessly added to the database, and decisions on the legitimacy of access requests can be made by using efficient computational methods for which attractive technical results exist. The approach enables the specification of security requirements to be exploited to help to improve the efficiency of query evaluation, and naturally extends to enable deductive databases to be protected against unauthorized update and revision requests.

Protecting Deductive Databases from Unauthorized Retrievals