@misc{cryptoeprint:2008:529,
author = {Zhimin Chen, Sergey Morozov, Patrick Schaumont},
title = {A Hardware Interface for Hashing Algorithms},
howpublished = {Cryptology ePrint Archive, Report 2008/529},
year = {2008},
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.