Cryptology ePrint Archive: BibTeX Citation of Report 2013/228

@misc{cryptoeprint:2013:228,
    author = {Kwangsu Lee and Woo Kwon Koo and Dong Hoon Lee and Jong Hwan Park},
    title = {Public-Key Revocation and Tracing Schemes with Subset Difference Methods Revisited},
    howpublished = {Cryptology ePrint Archive, Report 2013/228},
    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.