@misc{cryptoeprint:2011:049,
    author = {Allison Lewko and Brent Waters},
    title = {Unbounded HIBE and Attribute-Based Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2011/049},
    year = {2011},
    url = {http://eprint.iacr.org/2011/049},
}