Cryptology ePrint Archive: BibTeX Citation of Report 2011/448

@misc{cryptoeprint:2011:448,
    author = {Sourav Sen Gupta and Subhamoy Maitra and Goutam Paul and Santanu Sarkar},
    title = {(Non-)Random Sequences from (Non-)Random Permutations - Analysis of RC4 stream cipher},
    howpublished = {Cryptology ePrint Archive, Report 2011/448},
    year = {2011},
    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.