@misc{cryptoeprint:2011:233,
author = {Vipul Goyal and Adam O'Neill and Vanishree Rao},
title = {Correlated-Input Secure Hash Functions},
howpublished = {Cryptology ePrint Archive, Report 2011/233},
year = {2011},
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.