@misc{cryptoeprint:2015:549,
author = {Amir Hassani Karbasi, Reza Ebrahimi Atani },
title = {ILTRU: An NTRU-Like Public Key Cryptosystem Over Ideal Lattices},
howpublished = {Cryptology ePrint Archive, Report 2015/549},
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.