Cryptology ePrint Archive: BibTeX Citation of Report 2002/030

@misc{cryptoeprint:2002:030,
    author = {Boris Ryabko},
    title = {Adaptive chi-square test and its application to some cryptographic problems.},
    howpublished = {Cryptology ePrint Archive, Report 2002/030},
    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.