@misc{cryptoeprint:2010:165,
author = {Yalin Chen1, Jue-Sam Chou2,* , Chun-Hui Huang3},
title = {Comment on four two-party authentication protocols},
howpublished = {Cryptology ePrint Archive, Report 2010/165},
year = {2010},
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.