@misc{cryptoeprint:2014:434,
author = {Joop van de Pol and Nigel P. Smart and Yuval Yarom},
title = {Just a Little Bit More},
howpublished = {Cryptology ePrint Archive, Report 2014/434},
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.