@misc{cryptoeprint:2013:750,
author = {Xi-Jun Lin and Lin Sun},
title = {Fully Deniable Mutual Authentication Protocol Based on RSA Signature},
howpublished = {Cryptology ePrint Archive, Report 2013/750},
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.