@misc{cryptoeprint:2004:275,
author = {Wei-Chi Ku and Chun-Ming Ho},
title = {An e-Voting Scheme with Improved Resistance to Bribe and Coercion},
howpublished = {Cryptology ePrint Archive, Report 2004/275},
year = {2004},
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.