Cryptology ePrint Archive: BibTeX Citation of Report 2007/115

@misc{cryptoeprint:2007:115,
    author = {Carl Bracken and Eimear Byrne and Nadya Markin and Gary McGuire},
    title = {Quadratic Almost Perfect Nonlinear Functions With Many Terms},
    howpublished = {Cryptology ePrint Archive, Report 2007/115},
    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.