Cryptology ePrint Archive: BibTeX Citation of Report 2013/368

@misc{cryptoeprint:2013:368,
    author = {Jacques Patarin},
    title = {Security in $O(2^n)$ for the Xor of Two Random Permutations\\ -- Proof with the standard $H$ technique--},
    howpublished = {Cryptology ePrint Archive, Report 2013/368},
    year = {2013},
    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.