@misc{cryptoeprint:2005:378,
author = {Sven Laur and Helger Lipmaa},
title = {A New Protocol for Conditional Disclosure of Secrets And Its Applications},
howpublished = {Cryptology ePrint Archive, Report 2005/378},
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.