Cryptology ePrint Archive: BibTeX Citation of Report 2008/338

@misc{cryptoeprint:2008:338,
    author = {Koji Nuida and Satoshi Fujitsu and Manabu Hagiwara and Takashi Kitagawa and Hajime Watanabe and Kazuto Ogawa and Hideki Imai},
    title = {An improvement of discrete Tardos fingerprinting codes},
    howpublished = {Cryptology ePrint Archive, Report 2008/338},
    year = {2008},
    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.