Cryptology ePrint Archive: BibTeX Citation of Report 2012/213

@misc{cryptoeprint:2012:213,
    author = {Kaoru Kurosawa and Ryo Nojima and Le Trieu Phong},
    title = {Relation between Verifiable Random Functions and Convertible Undeniable Signatures, and New Constructions},
    howpublished = {Cryptology ePrint Archive, Report 2012/213},
    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.