@misc{cryptoeprint:2012:366,
author = {Dana Dachman-Soled and Yael Tauman Kalai},
title = {Securing Circuits Against Constant-Rate Tampering},
howpublished = {Cryptology ePrint Archive, Report 2012/366},
year = {2012},
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.