Cryptology ePrint Archive: BibTeX Citation of Report 2007/427

@misc{cryptoeprint:2007:427,
    author = {Sumanta Sarkar and Subhamoy Maitra},
    title = {Idempotents in the Neighbourhood of Patterson-Wiedemann Functions having Walsh Spectra Zeros},
    howpublished = {Cryptology ePrint Archive, Report 2007/427},
    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.