Cryptology ePrint Archive: BibTeX Citation of Report 2003/193

@misc{cryptoeprint:2003:193,
    author = {Ron Steinfeld and Huaxiong Wang and Josef Pieprzyk},
    title = {Efficient Extension of Standard Schnorr/RSA signatures into Universal Designated-Verifier Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2003/193},
    year = {2003},
    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.