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An inference channel exists if it is possible for a low-clearance user to infer high-classification data from low-classification data. Inference channels can be blocked by upgrading the security classification of some of the low-level data. The task of eliminating inference channels is formulated for solution by the Davis-Putnam theorem-proving procedure. The procedure is augmented to search for solutions with minimum total upgrade cost.>
M.E. Stickel (Tue,) studied this question.