Cryptology ePrint Archive: BibTeX Citation of Report 2011/394

@misc{cryptoeprint:2011:394,
    author = {Helger Lipmaa and Bingsheng Zhang},
    title = {A More Efficient Computationally Sound Non-Interactive Zero-Knowledge Shuffle Argument},
    howpublished = {Cryptology ePrint Archive, Report 2011/394},
    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.