Cryptology ePrint Archive: BibTeX Citation of Report 2015/850

@misc{cryptoeprint:2015:850,
    author = {Zhen Liu and Duncan S. Wong},
    title = {Traceable CP-ABE on Prime Order Groups: Fully Secure and Fully Collusion-resistant Blackbox Traceable},
    howpublished = {Cryptology ePrint Archive, Report 2015/850},
    year = {2015},
    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.