@misc{cryptoeprint:2004:071,
author = {Benits Jr, Waldyr and Terada, Routo},
title = {An IBE Scheme to Exchange Authenticated Secret Keys},
howpublished = {Cryptology ePrint Archive, Report 2004/071},
year = {2004},
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.