@misc{cryptoeprint:2003:037,
    author = {Juan A. Garay and Philip MacKenzie and Ke Yang},
    title = {Strengthening Zero-Knowledge Protocols using Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2003/037},
    year = {2003},
    url = {http://eprint.iacr.org/2003/037},
}