@misc{cryptoeprint:2015:199,
author = {Amir Moradi and Gesine Hinterwälder},
title = {Side-Channel Security Analysis of Ultra-Low-Power FRAM-based MCUs},
howpublished = {Cryptology ePrint Archive, Report 2015/199},
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.