@misc{cryptoeprint:2012:174,
author = {Emmanuel VOLTE and Jacques PATARIN and Valérie NACHEF},
title = {Zero Knowledge with Rubik's Cubes and Non-Abelian Groups},
howpublished = {Cryptology ePrint Archive, Report 2012/174},
year = {2012},
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.