Cryptology ePrint Archive: BibTeX Citation of Report 2003/212

@misc{cryptoeprint:2003:212,
    author = {Jan Pelzl and Thomas Wollinger and Christof Paar},
    title = {High Performance Arithmetic for Hyperelliptic Curve Cryptosystems of Genus Two},
    howpublished = {Cryptology ePrint Archive, Report 2003/212},
    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.