@misc{cryptoeprint:2009:314,
author = {B. Pinkas and T. Schneider and N.P. Smart and S. Williams},
title = {Secure Two-Party Computation is Practical},
howpublished = {Cryptology ePrint Archive, Report 2009/314},
year = {2009},
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.