@misc{cryptoeprint:2005:277,
author = {Fumiyuki Momose and Jinhui Chao},
title = {Scholten Forms and Elliptic/Hyperelliptic Curves with Weak Weil Restrictions},
howpublished = {Cryptology ePrint Archive, Report 2005/277},
year = {2005},
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.