Cryptology ePrint Archive: BibTeX Citation of Report 2004/228

@misc{cryptoeprint:2004:228,
    author = {Honggang Hu and Dengguo Feng},
    title = {DISTRIBUTION OF R-PATTERNS IN THE KERDOCK-CODE BINARY SEQUENCES AND THE HIGHEST LEVEL SEQUENCES OF PRIMITIVE SEQUENCES OVER $Z_{2^l}$},
    howpublished = {Cryptology ePrint Archive, Report 2004/228},
    year = {2004},
    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.