Cryptology ePrint Archive: BibTeX Citation of Report 2008/010

@misc{cryptoeprint:2008:010,
    author = {Jacques Patarin},
    title = {A Proof of Security in $O(2^n)$ for the Xor of Two Random Permutations\\ -- Proof with the ``$H_{\sigma}$ technique''--},
    howpublished = {Cryptology ePrint Archive, Report 2008/010},
    year = {2008},
    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.