@misc{cryptoeprint:2014:927,
author = {Bruno Robisson and Hélène Le Bouder},
title = {Physical functions : the common factor of side-channel and fault attacks ?},
howpublished = {Cryptology ePrint Archive, Report 2014/927},
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.