@misc{cryptoeprint:2013:498,
author = {Stefan Dziembowski and Tomasz Kazana and Maciej Obremski},
title = {Non-Malleable Codes from Two-Source Extractors},
howpublished = {Cryptology ePrint Archive, Report 2013/498},
year = {2013},
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.