Cryptology ePrint Archive: BibTeX Citation of Report 2006/427

@misc{cryptoeprint:2006:427,
    author = {Aya Comuta and Mitsuru Kawazoe and Tetsuya Takahashi},
    title = {Pairing-friendly elliptic curves with small security loss by Cheon's algorithm},
    howpublished = {Cryptology ePrint Archive, Report 2006/427},
    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.