@misc{cryptoeprint:2006:421,
author = {Jin Zhou, TingMao Chang, YaJuan Zhang, YueFei Zhu},
title = {Universally Composable Three-Party Key Distribution},
howpublished = {Cryptology ePrint Archive, Report 2006/421},
year = {2006},
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.