||Byzantine Clients Rendered Harmless
|LCS Document Number:
|Byzantine quorum systems have been proposed that work properly even when up to f replicas fail arbitrarily.
However, these systems are not so successful when confronted with Byzantine faulty clients. This paper presents novel
protocols that provide atomic semantics despite Byzantine clients. Our protocols are the first to handle all problems
caused by Byzantine clients. They prevent Byzantine clients from interfering with good clients: bad clients cannot
prevent good clients from completing reads and writes, and they cannot cause good clients to see inconsistencies. In
addition we also prevent bad clients that have been removed from operation from leaving behind more than a bounded
number of writes that could be done on their behalf by a colluder.
Our protocols are designed to work in an asynchronous system like the Internet and they are highly efficient. We
require 3f +1 replicas, and either two or three phases to do writes; reads normally complete in one phase and require
no more than two phases, no matter what the bad clients are doing.
We also present strong correctness conditions for systems with Byzantine clients that limit what can be done on
behalf of bad clients once they leave the system. Furthermore we prove that our protocols are both safe (they meet
those conditions) and live.
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