Cryptology ePrint Archive: BibTeX Citation of Report 2015/896

@misc{cryptoeprint:2015:896,
    author = {Xiaoyang Dong and Leibo Li and Keting Jia and Xiaoyun Wang},
    title = {Improved Attacks on Reduced-Round Camellia-128/192/256},
    howpublished = {Cryptology ePrint Archive, Report 2015/896},
    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.