Cryptology ePrint Archive: BibTeX Citation of Report 2002/123

@misc{cryptoeprint:2002:123,
    author = {Kaoru Kurosawa, Tetsu Iwata and Takayuki Yoshiwara},
    title = {New covering radius of Reed-Muller codes for $t$-resilient functions},
    howpublished = {Cryptology ePrint Archive, Report 2002/123},
    year = {2002},
    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.