Cryptology ePrint Archive: BibTeX Citation of Report 2008/118

@misc{cryptoeprint:2008:118,
    author = {Patrick Longa and Catherine Gebotys},
    title = {Setting Speed Records with the (Fractional) Multibase Non-Adjacent Form Method for Efficient Elliptic Curve Scalar Multiplication},
    howpublished = {Cryptology ePrint Archive, Report 2008/118},
    year = {2008},
    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.