@misc{cryptoeprint:2010:195,
author = {Sven Heiberg, Helger Lipmaa, Filip Van Laenen},
title = {On E-Vote Integrity in the Case of Malicious Voter Computers},
howpublished = {Cryptology ePrint Archive, Report 2010/195},
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.