@misc{cryptoeprint:2012:651,
    author = {Kan Yang and Zhen Liu and Zhenfu Cao and Xiaohua Jia and Duncan S. Wong and Kui Ren},
    title = {TAAC: Temporal Attribute-based Access Control for Multi-Authority Cloud Storage Systems},
    howpublished = {Cryptology ePrint Archive, Report 2012/651},
    year = {2012},
    url = {http://eprint.iacr.org/2012/651},
}