Cryptology ePrint Archive: BibTeX Citation of Report 2009/218

@misc{cryptoeprint:2009:218,
    author = {Jean-Philippe Aumasson and Itai Dinur and Luca Henzen and Willi Meier and Adi Shamir},
    title = {Efficient FPGA Implementations of High-Dimensional Cube Testers on the Stream Cipher Grain-128},
    howpublished = {Cryptology ePrint Archive, Report 2009/218},
    year = {2009},
    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.