Cryptology ePrint Archive: BibTeX Citation of Report 2013/495

@misc{cryptoeprint:2013:495,
    author = {Le Su and Hoon Wei Lim and San Ling and Huaxiong Wang},
    title = {Revocable IBE Systems with Almost Constant-size Key Update},
    howpublished = {Cryptology ePrint Archive, Report 2013/495},
    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.