Cryptology ePrint Archive: BibTeX Citation of Report 2014/648

@misc{cryptoeprint:2014:648,
    author = {Xi Chen, Yazhi Deng, Min Zhu and Longjiang Qu},
    title = {An Equivalent Condition on the Switching Construction of Differentially 4-uniform Permutations on $\gf_{2^{2k}}$ from the Inverse Function},
    howpublished = {Cryptology ePrint Archive, Report 2014/648},
    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.