Cryptology ePrint Archive: BibTeX Citation of Report 2014/216

@misc{cryptoeprint:2014:216,
    author = {Francesco Aldà and Riccardo Aragona and Lorenzo Nicolodi and Massimiliano Sala},
    title = {Implementation and Improvement of the Partial Sum Attack on 6-round AES},
    howpublished = {Cryptology ePrint Archive, Report 2014/216},
    year = {2014},
    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.