Cryptology ePrint Archive: BibTeX Citation of Report 2007/452

@misc{cryptoeprint:2007:452,
    author = {Ezekiel J. Kachisa and Edward F. Schaefer and Michael Scott },
    title = {Constructing Brezing-Weng pairing friendly elliptic curves using elements in the cyclotomic field},
    howpublished = {Cryptology ePrint Archive, Report 2007/452},
    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.