Cryptology ePrint Archive: BibTeX Citation of Report 2006/467

@misc{cryptoeprint:2006:467,
    author = {Donghoon Chang and Moti Yung},
    title = {Do We Need to Vary the Constants? (Methodological Investigation of Block-Cipher Based Hash Functions)},
    howpublished = {Cryptology ePrint Archive, Report 2006/467},
    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.