Cryptology ePrint Archive: BibTeX Citation of Report 2004/373

@misc{cryptoeprint:2004:373,
    author = {Chunming Tang and Dingyi Pei and Zhuojun Liu},
    title = {Delegateable Signature Using Witness Indistinguishable and Witness Hiding Proofs},
    howpublished = {Cryptology ePrint Archive, Report 2004/373},
    year = {2004},
    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.