@misc{cryptoeprint:2008:384,
author = {Pascal Junod and Alexandre Karlov and Arjen K. Lenstra},
title = {Improving the Boneh-Franklin Traitor Tracing Scheme},
howpublished = {Cryptology ePrint Archive, Report 2008/384},
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.