Cryptology ePrint Archive: BibTeX Citation of Report 2007/386

@misc{cryptoeprint:2007:386,
    author = {Tsz Hon Yuen and Man Ho Au and Joseph K. Liu and Willy Susilo},
    title = {(Convertible) Undeniable Signatures without Random Oracles},
    howpublished = {Cryptology ePrint Archive, Report 2007/386},
    year = {2007},
    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.