@misc{cryptoeprint:2011:701,
    author = {Tatsuaki Okamoto and Katsuyuki Takashima},
    title = {Decentralized Attribute-Based Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2011/701},
    year = {2011},
    url = {http://eprint.iacr.org/2011/701},
}