@misc{cryptoeprint:2007:221,
    author = {Michel Abdalla and Eike Kiltz and Gregory Neven},
    title = {Generalized Key Delegation for Hierarchical Identity-Based Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2007/221},
    year = {2007},
    url = {http://eprint.iacr.org/2007/221},
}