Cryptology ePrint Archive: BibTeX Citation of Report 2012/605

@misc{cryptoeprint:2012:605,
    author = {Jin Li, Xiaofeng Chen, Jingwei Li, Chunfu Jia, Duncan S. Wong, Willy Susilo},
    title = {Secure Outsourced Attribute-Based Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2012/605},
    year = {2012},
    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.