Cryptology ePrint Archive: BibTeX Citation of Report 2006/109

@misc{cryptoeprint:2006:109,
    author = {Willi Geiselmann and Fabian Januszewski and Hubert Koepfer and Jan Pelzl and Rainer Steinwandt},
    title = {A Simpler Sieving Device: Combining ECM and TWIRL},
    howpublished = {Cryptology ePrint Archive, Report 2006/109},
    year = {2006},
    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.