Cryptology ePrint Archive: BibTeX Citation of Report 2015/157

@misc{cryptoeprint:2015:157,
    author = {Nuttapong Attrapadung and Shota Yamada},
    title = {Duality in ABE: Converting Attribute Based Encryption for Dual Predicate and Dual Policy via Computational Encodings},
    howpublished = {Cryptology ePrint Archive, Report 2015/157},
    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.