@misc{cryptoeprint:2011:446,
    author = {Huang Lin and Yuguang Fang and Zhenfu Cao},
    title = {Private Information Extraction over Online Social Networks},
    howpublished = {Cryptology ePrint Archive, Report 2011/446},
    year = {2011},
    url = {http://eprint.iacr.org/2011/446},
}