@misc{cryptoeprint:2010:262,
author = {Alan Kaminsky},
title = {Cube Test Analysis of the Statistical Behavior of CubeHash and Skein},
howpublished = {Cryptology ePrint Archive, Report 2010/262},
year = {2010},
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.