Cryptology ePrint Archive: BibTeX Citation of Report 2013/224

@misc{cryptoeprint:2013:224,
    author = {Yuanyuan Zhou and Yu Yu and François-Xavier Standaert and Jean-Jacques Quisquater},
    title = {On the Need of Physical Security for Small Embedded Devices: a Case Study with COMP128-1 Implementations in SIM Cards },
    howpublished = {Cryptology ePrint Archive, Report 2013/224},
    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.