Keeping Secrets in Incomplete Databases [ Extended
نویسنده
چکیده
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 evaluation can be analyzed wrt. possibly incomplete logic databases. For each distortion method – lying and refusal – a class of confidentiality-preserving mechanisms is presented. Furthermore, we specify a third approach that combines lying and refusal and compensates the disadvantages of the respective uniform methods.
منابع مشابه
مسؤولیت مدنی ناشی از افشای اسرار پزشکی در حقوق ایران و کامنلا
Revealing medical secrets is one of the most important topics in medical law, and has an ancient root in medical history and morality. Keeping patients' secrets is one of the certain laws in internal and international laws and regulations of the most countries that have been recognized in patients' bill of rights. Keeping patients' secrets causes patients to confide in physicians and refer to t...
متن کاملKeeping Secrets in Possibilistic Knowledge Bases with Necessity-Valued Privacy Policies
Controlled Query Evaluation (CQE) is a logical framework for the protection of secrets in databases. In this article, we extend the CQE framework to possibilistic logic: knowledge base, a priori knowledge and privacy policy are expressed with necessity-valued formulas that represent several degrees of certainty. We present a formal security de nition and analyze an appropriate controlled evalua...
متن کاملA framework for inference control in incomplete logic databases
Security in information systems aims at various, possibly conflicting goals, two of which are availablility and confidentiality. On the one hand, as much information as possible should be provided to the user. On the other hand, certain information may be confidential and must not be disclosed. In this context, inferences are a major problem: The user might combine a priori knowledge and public...
متن کاملSecrets from friends and parents: longitudinal links with depression and antisocial behavior.
Keeping secrets from parents is associated with depression and antisocial behavior. The current study tested whether keeping secrets from best friends is similarly linked to maladjustment, and whether associations between secrecy and maladjustment are moderated by the quality of the friendship. Adolescents (N = 181; 51% female, 48% white, non-Hispanic, 45% African American) reported their secre...
متن کامل