Cryptology ePrint Archive: BibTeX Citation of Report 2012/327

@misc{cryptoeprint:2012:327,
    author = {Wang Shao-hui, Han Zhijie, Liu Sujuan, Chen Dan-wei},
    title = {Security Analysis of RAPP An RFID Authentication Protocol based on Permutation},
    howpublished = {Cryptology ePrint Archive, Report 2012/327},
    year = {2012},
    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.