@misc{cryptoeprint:2003:149,
    author = {Danfeng Yao and Anna Lysyanskaya},
    title = {Forward-Secure Hierarchical ID-Based Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2003/149},
    year = {2003},
    url = {http://eprint.iacr.org/2003/149},
}