@misc{cryptoeprint:1997:006,
    author = {Yuval Ishai and Eyal Kushilevitz},
    title = {Protecting Data Privacy in Private Information Retrieval Schemes},
    howpublished = {Cryptology ePrint Archive, Report 1997/006},
    year = {1997},
    url = {http://eprint.iacr.org/1997/006},
}