@misc{cryptoeprint:2013:453,
author = {Nasour Bagheri, Masoumeh Safkhani},
title = {Secret Disclosure attack on Kazahaya, a Yoking-Proof For Low-Cost RFID Tags},
howpublished = {Cryptology ePrint Archive, Report 2013/453},
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.