@misc{cryptoeprint:1999:008,
    author = {Jan Camenisch and Ivan Damgaard },
    title = {Verifiable Encryption and Applications to Group Signatures and Signature Sharing },
    howpublished = {Cryptology ePrint Archive, Report 1999/008},
    year = {1999},
    url = {http://eprint.iacr.org/1999/008},
}