Cryptology ePrint Archive: BibTeX Citation of Report 2009/264

@misc{cryptoeprint:2009:264,
    author = {Shigeo Tsujii and Kohtaro Tadaki and Masahito Gotaishi and Ryo Fujita and Masao Kasahara},
    title = {Proposal of PPS Multivariate Public Key Cryptosystems},
    howpublished = {Cryptology ePrint Archive, Report 2009/264},
    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.