Tolerating Byzantine Faulty Clients in a Quorum System

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 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 prese...

• Type: Conference
• Year: 2006
• Where: ICDCS
• Authors: Barbara Liskov, Rodrigo Rodrigues
• Keywords: Byzantine Clients, Byzantine Faulty Clients, Byzantine Quorum Systems, Distributed And Parallel Computing, ICDCS 2006