Cryptology ePrint Archive: BibTeX Citation of Report 2006/164

@misc{cryptoeprint:2006:164,
    author = {Zhengjun Cao},
    title = {Classification of Signature-only Signature Models},
    howpublished = {Cryptology ePrint Archive, Report 2006/164},
    year = {2006},
    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.