Cryptology ePrint Archive: BibTeX Citation of Report 2015/711

@misc{cryptoeprint:2015:711,
    author = {Anne Canteaut and Sébastien Duval and Gaëtan Leurent},
    title = {Construction of Lightweight S-Boxes using Feistel and MISTY structures (Full Version)},
    howpublished = {Cryptology ePrint Archive, Report 2015/711},
    year = {2015},
    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.