Cryptology ePrint Archive: BibTeX Citation of Report 2007/437

@misc{cryptoeprint:2007:437,
    author = {Cuauhtemoc Mancillas-Lopez and  Debrup Chakraborty  and Francisco Rodriguez-Henriquez},
    title = {Reconfigurable Hardware Implementations of Tweakable Enciphering Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2007/437},
    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.