Cryptology ePrint Archive: BibTeX Citation of Report 2014/468

@misc{cryptoeprint:2014:468,
    author = {Jan Camenisch, Anja Lehmann, Gregory Neven, Alfredo Rial},
    title = {Privacy-Preserving Auditing for Attribute-Based Credentials},
    howpublished = {Cryptology ePrint Archive, Report 2014/468},
    year = {2014},
    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.