@misc{cryptoeprint:2012:612,
author = {Byoung-Il Kim and Jin Hong},
title = {Analysis of the Non-Perfect Table Fuzzy Rainbow Tradeoff},
howpublished = {Cryptology ePrint Archive, Report 2012/612},
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.