@misc{cryptoeprint:2015:998,
author = {Paolo D'Arco and Navid Nasr Esfahani and Douglas R. Stinson},
title = {All or Nothing at All},
howpublished = {Cryptology ePrint Archive, Report 2015/998},
year = {2015},
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.