@misc{cryptoeprint:2006:082,
author = {HariGovind V. Ramasamy and Christian Cachin},
title = {Parsimonious Asynchronous Byzantine-Fault-Tolerant Atomic Broadcast},
howpublished = {Cryptology ePrint Archive, Report 2006/082},
year = {2006},
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.