Cryptology ePrint Archive: BibTeX Citation of Report 2009/491

@misc{cryptoeprint:2009:491,
    author = {Emiliano De Cristofaro and Gene Tsudik},
    title = {Practical Private Set Intersection Protocols with  Linear Computational and Bandwidth Complexity},
    howpublished = {Cryptology ePrint Archive, Report 2009/491},
    year = {2009},
    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.