@misc{cryptoeprint:2015:969,
author = {Claude Crepéau and Raza Ali Kazmi},
title = {Zero-Knowledge Interactive Proof Systems for New Lattice Problems},
howpublished = {Cryptology ePrint Archive, Report 2015/969},
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.