@misc{cryptoeprint:2008:450,
author = {Yongdong WU and Robert H. Deng},
title = {On the Security of Fully Collusion Resistant Traitor Tracing Schemes},
howpublished = {Cryptology ePrint Archive, Report 2008/450},
year = {2008},
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.