@misc{cryptoeprint:2005:394,
author = {Ben Adida and Douglas Wikstr\"{o}m},
title = {How to Shuffle in Public},
howpublished = {Cryptology ePrint Archive, Report 2005/394},
year = {2005},
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.