Cryptology ePrint Archive: BibTeX Citation of Report 2012/715

@misc{cryptoeprint:2012:715,
    author = {Jingyuan Zhao and Meiqin Wang and Jiazhe Chen and Yuliang Zheng},
    title = {New Impossible Differential Attack on $\text{SAFER}_{+}$ and $\text{SAFER}_{++}$},
    howpublished = {Cryptology ePrint Archive, Report 2012/715},
    year = {2012},
    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.