Cryptology ePrint Archive: BibTeX Citation of Report 2011/193

@misc{cryptoeprint:2011:193,
    author = {Nasour Bagheri, Masoumeh Safkhani, Majid Naderi, and Somitra Kumar Sanadhya},
    title = {Security Analysis of $LMAP^{++}$, an RFID Authentication Protocol},
    howpublished = {Cryptology ePrint Archive, Report 2011/193},
    year = {2011},
    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.