Cryptology ePrint Archive: BibTeX Citation of Report 2015/964

@misc{cryptoeprint:2015:964,
    author = {Danping Shi and Lei Hu and Siwei Sun and Ling Song},
    title = {Linear (hull) Cryptanalysis of Round-reduced Versions of KATAN},
    howpublished = {Cryptology ePrint Archive, Report 2015/964},
    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.