@misc{cryptoeprint:2008:113,
author = {Daniel Mall and Qing Zhong},
title = {Open Source Is Not Enough. Attacking the EC-package of Bouncycastle version 1.x_132},
howpublished = {Cryptology ePrint Archive, Report 2008/113},
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.