@misc{cryptoeprint:2012:711,
    author = {Kai-Min Chung and Edward Lui and Mohammad Mahmoody and Rafael Pass},
    title = {Unprovable Security of Two-Message Zero Knowledge},
    howpublished = {Cryptology ePrint Archive, Report 2012/711},
    year = {2012},
    url = {http://eprint.iacr.org/2012/711},
}