@misc{cryptoeprint:2015:652,
author = {Benjamin Dowling and Douglas Stebila},
title = {Modelling ciphersuite and version negotiation in the TLS protocol},
howpublished = {Cryptology ePrint Archive, Report 2015/652},
year = {2015},
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.