@misc{cryptoeprint:2009:176,
author = {Yalin Chen, Chun-Hui Huang, *Jue-Sam Chou},
title = {A novel multi-server authentication protocol},
howpublished = {Cryptology ePrint Archive, Report 2009/176},
year = {2009},
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.