@misc{cryptoeprint:2007:068,
    author = {Man Ho Au and Joseph K. Liu and Tsz Hon Yuen and Duncan S. Wong},
    title = {Efficient Hierarchical Identity Based Signature in the Standard Model},
    howpublished = {Cryptology ePrint Archive, Report 2007/068},
    year = {2007},
    url = {http://eprint.iacr.org/2007/068},
}