@misc{cryptoeprint:2014:348,
author = {Helger Lipmaa},
title = {A Simple Cast-as-Intended E-Voting Protocol by Using Secure Smart Cards},
howpublished = {Cryptology ePrint Archive, Report 2014/348},
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.