@misc{cryptoeprint:2009:225,
author = {Jooyoung Lee and Daesung Kwon},
title = {The Security of Abreast-DM in the Ideal Cipher Model},
howpublished = {Cryptology ePrint Archive, Report 2009/225},
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.