@misc{cryptoeprint:2009:511,
author = {Boaz Barak and Iftach Haitner and Dennis Hofheinz and Yuval Ishai},
title = {Bounded Key-Dependent Message Security},
howpublished = {Cryptology ePrint Archive, Report 2009/511},
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.