Cryptology ePrint Archive: BibTeX Citation of Report 2009/061

@misc{cryptoeprint:2009:061,
    author = {Shigeo Tsujii and Kohtaro Tadaki and Ryou Fujita and Masahito Gotaishi and Toshinobu Kaneko},
    title = {Security Enhancement of Various MPKCs by 2-layer Nonlinear Piece In Hand Method},
    howpublished = {Cryptology ePrint Archive, Report 2009/061},
    year = {2009},
    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.