Cryptology ePrint Archive: BibTeX Citation of Report 2007/449

@misc{cryptoeprint:2007:449,
    author = {Jacques Patarin and Valérie Nachef and Côme Berbain},
    title = {Generic Attacks on Unbalanced Feistel Schemes with Expanding Functions},
    howpublished = {Cryptology ePrint Archive, Report 2007/449},
    year = {2007},
    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.