Cryptology ePrint Archive: BibTeX Citation of Report 2011/503

@misc{cryptoeprint:2011:503,
    author = {Christina Boura and Anne Canteaut},
    title = {On the influence of the algebraic degree of $F^{−1}$ on the algebraic degree of $G \circ F$},
    howpublished = {Cryptology ePrint Archive, Report 2011/503},
    year = {2011},
    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.