Cryptology ePrint Archive: BibTeX Citation of Report 2011/524

@misc{cryptoeprint:2011:524,
    author = {Leibo Li,  Jiazhe Chen and Xiaoyun Wang},
    title = {Security of Reduced-Round Camellia against Impossible Differential Attack },
    howpublished = {Cryptology ePrint Archive, Report 2011/524},
    year = {2011},
    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.