Cryptology ePrint Archive: BibTeX Citation of Report 2008/407

@misc{cryptoeprint:2008:407,
    author = {Donghoon Chang and  Jaechul Sung and Seokhie Hong and Sangjin Lee},
    title = {Indifferentiable Security Analysis of choppfMD, chopMD, a chopMDP, chopWPH, chopNI, chopEMD, chopCS, and chopESh Hash Domain Extensions},
    howpublished = {Cryptology ePrint Archive, Report 2008/407},
    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.