Cryptology ePrint Archive: BibTeX Citation of Report 2015/240

@misc{cryptoeprint:2015:240,
    author = {Alex Biryukov, Patrick Derbez and Léo Perrin},
    title = {Differential Analysis and Meet-in-the-Middle Attack against Round-Reduced TWINE},
    howpublished = {Cryptology ePrint Archive, Report 2015/240},
    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.