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While information systems became ever more complex and the interdependence of these systems increased, mission-critical services should be survivable even in the presence of cyber attacks or internal failures. Node replication can be used to protect a mission-critical system against faults that may occur naturally or be caused by malicious attackers. The overall reliability increases by the number of replicas. However, when the replicas are a perfect copy of each other, a successful attack or failure in any node can be instantaneously repeated in all the other nodes.
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