@misc{cryptoeprint:2011:508,
author = {Ivan Damg{\aa}rd and Sebastian Faust and Carmit Hazay},
title = {Secure Two-Party Computation with Low Communication},
howpublished = {Cryptology ePrint Archive, Report 2011/508},
year = {2011},
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.