@misc{cryptoeprint:2008:236,
author = {P. Morrissey and N.P.Smart and B. Warinschi},
title = {A Modular Security Analysis of the TLS Handshake Protocol},
howpublished = {Cryptology ePrint Archive, Report 2008/236},
year = {2008},
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.