Cryptology ePrint Archive: BibTeX Citation of Report 2007/117

@misc{cryptoeprint:2007:117,
    author = {Sihem Mesnager},
    title = {Improving the lower bound on the higher order nonlinearity of Boolean functions with prescribed algebraic immunity},
    howpublished = {Cryptology ePrint Archive, Report 2007/117},
    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.