Cryptology ePrint Archive: BibTeX Citation of Report 2013/419

@misc{cryptoeprint:2013:419,
    author = {Rikke Bendlin and Sara Krehbiel and Chris Peikert},
    title = {How to Share a Lattice Trapdoor: Threshold Protocols for Signatures and (H)IBE},
    howpublished = {Cryptology ePrint Archive, Report 2013/419},
    year = {2013},
    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.