@misc{cryptoeprint:2009:274,
author = {Xigen.Yao},
title = {A Collision-resistance Hash Function DIHA2},
howpublished = {Cryptology ePrint Archive, Report 2009/274},
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.