Cryptology ePrint Archive: BibTeX Citation of Report 2005/004

@misc{cryptoeprint:2005:004,
    author = {Jacques Patarin and Audrey Montreuil},
    title = {Benes and Butterfly schemes revisited},
    howpublished = {Cryptology ePrint Archive, Report 2005/004},
    year = {2005},
    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.