Cryptology ePrint Archive: BibTeX Citation of Report 2005/304

@misc{cryptoeprint:2005:304,
    author = {Adam Bender and Jonathan Katz and Ruggero Morselli},
    title = {Ring Signatures: Stronger Definitions, and Constructions without Random Oracles},
    howpublished = {Cryptology ePrint Archive, Report 2005/304},
    year = {2005},
    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.