Cryptology ePrint Archive: BibTeX Citation of Report 2014/207

@misc{cryptoeprint:2014:207,
    author = {Katsuyuki Takashima},
    title = {Expressive Attribute-Based Encryption with Constant-Size Ciphertexts from the Decisional Linear Assumption},
    howpublished = {Cryptology ePrint Archive, Report 2014/207},
    year = {2014},
    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.