Cryptology ePrint Archive: BibTeX Citation of Report 2014/315

@misc{cryptoeprint:2014:315,
    author = {Bartosz Zoltak},
    title = {Statistical weaknesses in 20 RC4-like algorithms and (probably) the simplest algorithm free from these weaknesses - VMPC-R},
    howpublished = {Cryptology ePrint Archive, Report 2014/315},
    year = {2014},
    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.