@misc{cryptoeprint:2004:343,
author = {Kim-Kwang Raymond Choo},
title = {Revisit Of McCullagh--Barreto Two-Party ID-Based Authenticated Key Agreement Protocols},
howpublished = {Cryptology ePrint Archive, Report 2004/343},
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.