@misc{cryptoeprint:2012:573,
author = {Iftach Haitner and Eran Omri and Hila Zarosim},
title = {Limits on the Usefulness of Random Oracles},
howpublished = {Cryptology ePrint Archive, Report 2012/573},
year = {2012},
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.