@misc{cryptoeprint:2012:215,
    author = {Rosario Gennaro and Craig Gentry and Bryan Parno and Mariana Raykova},
    title = {Quadratic Span Programs and Succinct NIZKs without PCPs},
    howpublished = {Cryptology ePrint Archive, Report 2012/215},
    year = {2012},
    url = {http://eprint.iacr.org/2012/215},
}