Cryptology ePrint Archive: BibTeX Citation of Report 2011/546

@misc{cryptoeprint:2011:546,
    author = {Angelo De Caro and Vincenzo Iovino and Giuseppe Persiano},
    title = {Hidden Vector Encryption Fully Secure Against Unrestricted Queries},
    howpublished = {Cryptology ePrint Archive, Report 2011/546},
    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.