@misc{cryptoeprint:2014:389,
author = {Wei Dai and Yark{\i}n Dor\"{o}z and Berk Sunar},
title = {Accelerating NTRU based Homomorphic Encryption using GPUs},
howpublished = {Cryptology ePrint Archive, Report 2014/389},
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.