Cryptology ePrint Archive: BibTeX Citation of Report 2015/259

@misc{cryptoeprint:2015:259,
    author = {Patrick Derbez and Pierre-Alain Fouque},
    title = {Exhausting Demirci-Selçuk Meet-in-the-Middle Attacks against Reduced-Round AES},
    howpublished = {Cryptology ePrint Archive, Report 2015/259},
    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.