@misc{cryptoeprint:2014:625,
author = {Stephan Neumann and Christian Feier and Perihan Sahin and Sebastian Fach},
title = {Pretty Understandable Democracy 2.0},
howpublished = {Cryptology ePrint Archive, Report 2014/625},
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.