Cryptology ePrint Archive: BibTeX Citation of Report 2014/132

@misc{cryptoeprint:2014:132,
    author = {Kwangsu Lee and Dong Hoon Lee and Jong Hwan Park},
    title = {Efficient Revocable Identity-Based Encryption via Subset Difference Methods},
    howpublished = {Cryptology ePrint Archive, Report 2014/132},
    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.