@misc{cryptoeprint:2012:397,
author = {Liqun Chen and Hoon Wei Lim and Guomin Yang },
title = {Cross-Domain Password-Based Authenticated Key Exchange Revisited},
howpublished = {Cryptology ePrint Archive, Report 2012/397},
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.