Cryptology ePrint Archive: BibTeX Citation of Report 2012/535

@misc{cryptoeprint:2012:535,
    author = {Nuray At and Jean-Luc Beuchat and Eiji Okamoto and Ismail San and Teppei Yamazaki},
    title = {A Low-Area Unified Hardware Architecture for the AES and the Cryptographic Hash Function Gr{\o}stl},
    howpublished = {Cryptology ePrint Archive, Report 2012/535},
    year = {2012},
    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.