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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)
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)
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)