@misc{cryptoeprint:2003:188,
author = {Fei Hu and Chwan-Hwa Wu and J. D. Irwin },
title = {A New Forward Secure Signature Scheme using Bilinear Maps},
howpublished = {Cryptology ePrint Archive, Report 2003/188},
year = {2003},
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.