@misc{cryptoeprint:2008:038,
author = {Hassan Elkamchouchi and Yasmine Abouelseoud},
title = {A New Blind Identity-Based Signature Scheme with Message Recovery},
howpublished = {Cryptology ePrint Archive, Report 2008/038},
year = {2008},
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.