Cryptology ePrint Archive: BibTeX Citation of Report 1999/008

@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},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.