Refusal is Better than Lying
نویسنده
چکیده
A shared information system is expected to comply with the following potentially conflicting requirements. On the one side it should provide useful answers to arbitrary queries, while on the other side it should preserve certain secrets according to a security policy. We study and compare two previously suggested approaches to meet these requirements, namely refusal of statements and lying . The investigation is performed using a highly abstract and general framework, both with respect to the information system and the preservation of secrets. The assessment shows that in general refusal is better than lying. In particular while preserving the same secrets refusal can provide more useful answers.
منابع مشابه
Keeping Secrets in Incomplete Databases [ Extended
Controlled query evaluation preserves confidentiality in information systems at runtime. A security policy specifies the facts a certain user is not allowed to know. At each query, a censor checks whether the answer would enable the user to learn any classified information. In that case, the answer is distorted, either by lying or by refusal. We introduce a framework in which controlled query e...
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