Cryptology ePrint Archive: BibTeX Citation of Report 2003/047

@misc{cryptoeprint:2003:047,
    author = {Masao KASAHARA and Ryuichi SAKAI},
    title = {A Construction of 100 bit Public-Key Cryptosystem and Digital Signature Scheme},
    howpublished = {Cryptology ePrint Archive, Report 2003/047},
    year = {2003},
    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.