Controlled Query Evaluation for Known Policies by Combining Lying and Refusal

@article{Biskup2004ControlledQE,
  title={Controlled Query Evaluation for Known Policies by Combining Lying and Refusal},
  author={Joachim Biskup and Piero A. Bonatti},
  journal={Annals of Mathematics and Artificial Intelligence},
  year={2004},
  volume={40},
  pages={37-62}
}
Controlled query evaluation enforces security policies for confidentiality in information systems. It deals with users who may apply background knowledge to infer additional information from the answers to their queries. For each query the correct answer is first judged by some censor and then – if necessary – appropriately modified to preserve security. In previous approaches, modification has been done uniformly, either by lying or by refusal. A drawback of lying is that all disjunctions of… CONTINUE READING
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