Cryptology ePrint Archive: BibTeX Citation of Report 2011/171

@misc{cryptoeprint:2011:171,
    author = {Manish Garg and Sugata Gangopadhyay},
    title = {On lower bounds on second--order nonliearities of bent functions obtained by using Niho power functions},
    howpublished = {Cryptology ePrint Archive, Report 2011/171},
    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.