@misc{cryptoeprint:2007:323,
    author = {Rafail Ostrovsky and Amit Sahai and Brent Waters},
    title = {Attribute-Based Encryption with Non-Monotonic Access Structures},
    howpublished = {Cryptology ePrint Archive, Report 2007/323},
    year = {2007},
    url = {http://eprint.iacr.org/2007/323},
}