Cryptology ePrint Archive: BibTeX Citation of Report 2008/328

@misc{cryptoeprint:2008:328,
    author = {Hemanta Maji and Manoj Prabhakaran and Mike Rosulek},
    title = {Attribute-Based Signatures: Achieving Attribute-Privacy and Collusion-Resistance},
    howpublished = {Cryptology ePrint Archive, Report 2008/328},
    year = {2008},
    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.