Cryptology ePrint Archive: BibTeX Citation of Report 2012/669

@misc{cryptoeprint:2012:669,
    author = {Zhen Liu and Zhenfu Cao and Duncan S. Wong},
    title = {Blackbox Traceable CP-ABE: How to Catch People Leaking Their Keys by Selling Decryption Devices on eBay},
    howpublished = {Cryptology ePrint Archive, Report 2012/669},
    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.