Cryptology ePrint Archive: BibTeX Citation of Report 2014/272

@misc{cryptoeprint:2014:272,
    author = {Jiageng Chen, Yuichi Futa, Atsuko Miyaji, Chunhua Su},
    title = {Impossible differential cryptanalysis of LBlock with concrete investigation of key scheduling algorithm},
    howpublished = {Cryptology ePrint Archive, Report 2014/272},
    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.