Cryptology ePrint Archive: BibTeX Citation of Report 2012/402

@misc{cryptoeprint:2012:402,
    author = {Juan Manuel Gonz{\'a}lez Nieto and Mark Manulis and Dongdong Sun},
    title = {Forward-Secure Hierarchical Predicate Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2012/402},
    year = {2012},
    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.