Cryptology ePrint Archive: BibTeX Citation of Report 2009/064

@misc{cryptoeprint:2009:064,
    author = {Céline Blondeau and Benoît Gérard},
    title = {On the Data Complexity of Statistical Attacks Against Block Ciphers (full version)},
    howpublished = {Cryptology ePrint Archive, Report 2009/064},
    year = {2009},
    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.