@misc{cryptoeprint:2011:543,
    author = {Tatsuaki Okamoto and Katsuyuki Takashima},
    title = {Adaptively Attribute-Hiding (Hierarchical) Inner Product Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2011/543},
    year = {2011},
    url = {http://eprint.iacr.org/2011/543},
}