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in a two-dimensional statistical table (Extended abstract) Abstract We propose a method to protect sensitive information in a two-dimensional statistical table based on the suppression of certain marginal cells. A sensitive cell set is considered unprotected if its exact value can be computed from the values of nonsensitive cells and unsup-pressed marginal(More)
The method of the canonical connection introduced by Maier and Ullman provides an optimal procedure for query processing in universal-relation databases. We present an algorithm for computing canonical connections in a database scheme which is more efficient than the classical algorithm based on tableau reduction. Moreover, with a slight modification of the(More)
In response to queries asked to a statistical database, the query system should avoid releasing summary statistics that could lead to the disclosure of confidential individual data. Attacks to the security of a statistical database may be direct or indirect and, in order to repel them, the query system should audit queries by controlling the amount of(More)