Cryptology ePrint Archive: BibTeX Citation of Report 2011/509

@misc{cryptoeprint:2011:509,
    author = {Emil Stefanov and Elaine Shi and Dawn Song},
    title = {Policy-Enhanced Private Set Intersection: Sharing Information While Enforcing Privacy Policies},
    howpublished = {Cryptology ePrint Archive, Report 2011/509},
    year = {2011},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.