Cryptology ePrint Archive: BibTeX Citation of Report 2013/115

@misc{cryptoeprint:2013:115,
    author = {Kaitai Liang and Qiong Huang and Roman Schlegel and Duncan S. Wong and Chunming Tang},
    title = {A Conditional Proxy Broadcast Re-Encryption Scheme Supporting Timed-Release},
    howpublished = {Cryptology ePrint Archive, Report 2013/115},
    year = {2013},
    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.