@misc{cryptoeprint:2003:100,
author = {Yehuda Lindell},
title = {Protocols for Bounded-Concurrent Secure Two-Party Computation in the Plain Model},
howpublished = {Cryptology ePrint Archive, Report 2003/100},
year = {2003},
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.