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In the past, some research has been done on how to use proactive recovery to build intrusion-tolerant replicated systems that is resilient to any number of faults, as long as recoveries are faster than an upper bound on fault production assumed at system deployment time. In this paper, the authors propose a complementary approach that enhances proactive recovery with additional reactive mechanisms giving correct replicas the capability of recovering other replicas that are detected or suspected of being compromised. One key feature of the proactive-reactive recovery approach is that, despite recoveries, it guarantees the availability of a minimum number of system replicas necessary to sustain correct operation of the system.
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