Cryptology ePrint Archive: BibTeX Citation of Report 2015/481

@misc{cryptoeprint:2015:481,
    author = {Theodosis Mourouzis and Guangyan Song and Nicolas Courtois and Michalis Christofii},
    title = {Advanced Differential Cryptanalysis of Reduced-Round SIMON64/128 Using Large-Round Statistical Distinguishers},
    howpublished = {Cryptology ePrint Archive, Report 2015/481},
    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.