@misc{cryptoeprint:2014:440,
author = {Jean-Claude Bajard and Nabil Merkiche},
title = {Double Level Montgomery Cox-Rower Architecture, New Bounds},
howpublished = {Cryptology ePrint Archive, Report 2014/440},
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.