@misc{cryptoeprint:2012:669,
    author = {Zhen Liu and Zhenfu Cao and Duncan S. Wong},
    title = {Expressive Black-box Traceable Ciphertext-Policy Attribute-Based Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2012/669},
    year = {2012},
    url = {http://eprint.iacr.org/2012/669},
}