Cryptology ePrint Archive: Report 1996/006

Upper bound on the communication complexity of private information retrieval

Andris Ambainis

Abstract: Private information retrieval was introduced by Chor, Goldreich, Kushilevitz and Sudan. It is the problem of reading a bit from the database so that it remains secret which bit we need. If the database exists in several identical copies, it is possible to ask queries so that each of copies alone does not get any information about the adress of the needed bit. We construct a scheme for private information retrieval with k databases and O(n sup (1/(2k-1)) ) bits of communication.

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Publication Info: Appeared in the THEORY OF CRYPTOGRAPHY LIBRARY and has been included in the ePrint Archive.

Date: received May 23rd, 1996.

Contact author: ambainis at cclu lv

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