@misc{cryptoeprint:2009:484,
author = {Meiqin Wang, Xiaoyun Wang, Keting Jia, Wei Wang},
title = {New Pseudo-Near-Collision Attack on Reduced-Round of Hamsi-256},
howpublished = {Cryptology ePrint Archive, Report 2009/484},
year = {2009},
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.