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Information search and document retrieval from a remote database (e.g. cloud server) requires submitting the search terms to the database holder. However, the search terms may contain sensitive information that must be kept secret from the database holder. Moreover, the privacy concerns apply to the relevant documents retrieved by the user in the later stage since they may also contain sensitive data and reveal information about sensitive search terms. A related protocol, Private Informationdoi:10.1145/2320765.2320820 dblp:conf/edbt/OrencikS12 fatcat:yk5jbo2plvgstbclirvjrhp7x4