@misc{cryptoeprint:2008:325,
    author = {Chunbo Ma and Jun Ao},
    title = {Revisit of Group-based Unidirectional Proxy Re-encryption Scheme},
    howpublished = {Cryptology ePrint Archive, Report 2008/325},
    year = {2008},
    url = {http://eprint.iacr.org/2008/325},
}