@misc{cryptoeprint:2009:482,
    author = {Allison B. Lewko and Brent Waters},
    title = {Fully Secure HIBE with Short Ciphertexts},
    howpublished = {Cryptology ePrint Archive, Report 2009/482},
    year = {2009},
    url = {http://eprint.iacr.org/2009/482},
}