Cryptology ePrint Archive: BibTeX Citation of Report 2008/108

@misc{cryptoeprint:2008:108,
    author = {Jintai Ding AND Bo-Yin Yang AND Owen Chen AND Ming-Shing Chen AND Doug Cheng},
    title = {New Differential-Algebraic Attacks and Reparametrization of Rainbow},
    howpublished = {Cryptology ePrint Archive, Report 2008/108},
    year = {2008},
    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.