@misc{cryptoeprint:2014:336,
author = {Joppe W. Bos and Kristin Lauter and Michael Naehrig},
title = {Private Predictive Analysis on Encrypted Medical Data},
howpublished = {Cryptology ePrint Archive, Report 2014/336},
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.