Cryptology ePrint Archive: BibTeX Citation of Report 2005/454

@misc{cryptoeprint:2005:454,
    author = {Keisuke Hakuta and Hisayoshi Sato and Tsuyoshi Takagi},
    title = {Efficient Arithmetic on Subfield Elliptic Curves over Small Odd Characteristics},
    howpublished = {Cryptology ePrint Archive, Report 2005/454},
    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.