@misc{cryptoeprint:2014:321,
author = {Ahto Buldas and Risto Laanoja and Ahto Truu},
title = {Efficient Quantum-Immune Keyless Signatures with Identity},
howpublished = {Cryptology ePrint Archive, Report 2014/321},
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.