Cryptology ePrint Archive: BibTeX Citation of Report 2008/051

@misc{cryptoeprint:2008:051,
    author = {Patrick Longa and Ali Miri},
    title = {New Composite Operations and Precomputation Scheme for Elliptic Curve Cryptosystems over Prime Fields (full version)},
    howpublished = {Cryptology ePrint Archive, Report 2008/051},
    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.