@misc{cryptoeprint:2004:175,
author = {Yehuda Lindell and Benny Pinkas},
title = {A Proof of Yao's Protocol for Secure Two-Party Computation},
howpublished = {Cryptology ePrint Archive, Report 2004/175},
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.