Cryptology ePrint Archive: BibTeX Citation of Report 2002/020

@misc{cryptoeprint:2002:020,
    author = {Don Coppersmith and Shai Halevi and Charanjit Jutla},
    title = {Cryptanalysis of stream ciphers with linear masking},
    howpublished = {Cryptology ePrint Archive, Report 2002/020},
    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.