Cryptology ePrint Archive: BibTeX Citation of Report 2005/384

@misc{cryptoeprint:2005:384,
    author = {Dong-Guk Han and Tetsuya Izu  and Tsuyoshi Takagi},
    title = {Some Explicit Formulae of NAF and its Left-to-Right Analogue},
    howpublished = {Cryptology ePrint Archive, Report 2005/384},
    year = {2005},
    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.