Cryptology ePrint Archive: BibTeX Citation of Report 2004/184

@misc{cryptoeprint:2004:184,
    author = {Amit K Awasthi and Sunder Lal},
    title = {ID-based Ring Signature and Proxy Ring Signature Schemes from Bilinear Pairings},
    howpublished = {Cryptology ePrint Archive, Report 2004/184},
    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.