@misc{cryptoeprint:2012:459,
author = {Daniel Wichs},
title = {Barriers in Cryptography with Weak, Correlated and Leaky Sources},
howpublished = {Cryptology ePrint Archive, Report 2012/459},
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.