A characterization of eventual Byzantine agreement

Abstract
: We investigate eventual Byzantine agreement (EBA) in the crash andomission failure modes. The emphasis is on characterizing optimal EBA protocols interms of the states of knowledge required by the processors in order to attain EBA. It iswell known that common knowledge among the nonfaulty processors is a necessary andsufficient condition for attaining simultaneous Byzantine agreement (SBA). We define anew variant that we call continual common knowledge, and use it to provide necessary...

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