Cryptology ePrint Archive: BibTeX Citation of Report 2006/330

@misc{cryptoeprint:2006:330,
    author = {Christophe Doche and Laurent Imbert},
    title = {Extended Double-Base Number System with applications to Elliptic Curve Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2006/330},
    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.