@misc{cryptoeprint:1999:023,
    author = {Cynthia Dwork, Moni Naor and Amit Sahai},
    title = {Concurrent Zero-Knowledge},
    howpublished = {Cryptology ePrint Archive, Report 1999/023},
    year = {1999},
    url = {http://eprint.iacr.org/1999/023},
}