@misc{cryptoeprint:2002:156,
    author = {Jianying Zhou, Feng Bao, and Robert Deng},
    title = {Validating Digital Signatures without Time-Stamping and Certificate Revocation},
    howpublished = {Cryptology ePrint Archive, Report 2002/156},
    year = {2002},
    url = {http://eprint.iacr.org/2002/156},
}