@misc{cryptoeprint:2013:367,
author = {Florian Kohlar and Sven Schäge and Jörg Schwenk},
title = {On the Security of TLS-DH and TLS-RSA in the Standard Model},
howpublished = {Cryptology ePrint Archive, Report 2013/367},
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.