@misc{cryptoeprint:2014:232,
author = {Yark{\i}n Dor\"{o}z, Berk Sunar and Ghaith Hammouri},
title = {Bandwidth Efficient PIR from NTRU},
howpublished = {Cryptology ePrint Archive, Report 2014/232},
year = {2014},
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.