Cryptology ePrint Archive: BibTeX Citation of Report 2008/210

@misc{cryptoeprint:2008:210,
    author = {Haimin Jin and Duncan S. Wong and Yinlong Xu},
    title = {Complexity Analysis of a Fast Modular Multiexponentiation Algorithm},
    howpublished = {Cryptology ePrint Archive, Report 2008/210},
    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.