@misc{cryptoeprint:2015:352,
author = {Pavel Raykov},
title = {Broadcast from Minicast Secure Against General Adversaries},
howpublished = {Cryptology ePrint Archive, Report 2015/352},
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.