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Three decades ago, Pease et al. introduced the problem of Byzantine Agreement [PSL 80] where nodes need to maintain a consistent view of the world in spite of the challenge posed by Byzantine faults. Subsequently, it is well known that Byzantine agreement over a completely connected synchronous network of n nodes tolerating up to t faults is (efficiently) possible if and only if t < n/3. Pease...
Byzantine Agreement requires a set of nodes in a distributed system to agree on the message of a sender despite the presence of arbitrarily faulty nodes. Solutions for this problem are generally divided into two classes: authenticated protocols and non-authenticated protocols. In the former class, all messages are (digitally) signed and can be assigned to their respective signers, while in the latter...
Reaching agreement in the presence of Byzantine (arbitrary) faults is a fundamental problem in distributed systems. It has been shown that message authentication is a useful tool in designing protocols with high fault tolerance, but it imposes the additional problem of key distribution. In the past, agreement protocols using message authentication required complete agreement on all public keys...
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