Cryptology ePrint Archive: BibTeX Citation of Report 2007/268

@misc{cryptoeprint:2007:268,
    author = {Erik Dahmen and Katsuyuki Okeya and Daniel Schepers},
    title = {Affine Precomputation with Sole Inversion in Elliptic Curve Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2007/268},
    year = {2007},
    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.