Cryptology ePrint Archive: BibTeX Citation of Report 2012/509

@misc{cryptoeprint:2012:509,
    author = {Sebastian Kutzner and Phuong Ha Nguyen and  Axel Poschmann and Huaxiong Wang},
    title = {On 3-share Threshold Implementations for 4-bit S-boxes},
    howpublished = {Cryptology ePrint Archive, Report 2012/509},
    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.