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The need to enhance the security of data storage systems and to encrypt the content they store is obvious. Various encryption algorithms are in common use for many years, so content-encryption may be considered, for the most part, as an already-solved issue. Apparently, encryption alone does not suffice. A server, which maintains a data storage system, can gain information about its users' habits and interests, and violate their privacy, even without being able to decrypt the data that they store. The server can monitor the queries made by the clients and perform different traffic analysis tasks.
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