@misc{cryptoeprint:2010:181,
author = {He Debiao, Chen Jianhua, Hu Jin},
title = {Cryptanalysis of a DoS-resistant ID-based password authentication },
howpublished = {Cryptology ePrint Archive, Report 2010/181},
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.