@misc{cryptoeprint:1997:009,
author = {},
title = {Collision-Resistant Hashing: Towards Making UOWHFs Practical},
howpublished = {Cryptology ePrint Archive, Report 1997/009},
year = {1997},
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.