@misc{cryptoeprint:1998:003,
    author = {Benny Chor, Niv Gilboa, and Moni Naor},
    title = {Private Information Retrieval by Keywords},
    howpublished = {Cryptology ePrint Archive, Report 1998/003},
    year = {1998},
    url = {http://eprint.iacr.org/1998/003},
}