Cryptology ePrint Archive: BibTeX Citation of Report 2011/078

@misc{cryptoeprint:2011:078,
    author = {Jean-Luc Beuchat and Eiji Okamoto and Teppei Yamazaki},
    title = {A Low-Area Unified Hardware Architecture for the AES and the Cryptographic Hash Function ECHO},
    howpublished = {Cryptology ePrint Archive, Report 2011/078},
    year = {2011},
    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.