Asynchronous reconfiguration with Byzantine failures

Replicated services are inherently vulnerable to failures and security breaches. In a long-running system, it is, therefore, indispensable maintain reconfiguration mechanism that would replace faulty replicas with correct ones. An important challenge is enable without affecting the availability consistency of replicated data: clients should be able get service even when set being updated. this paper, we address problem in presence Byzantine failures: or may arbitrarily deviate from their expected behavior. We describe generic technique for building asynchronous fault-tolerant reconfigurable objects: can manipulate object data issue calls reaching consensus on current configuration. With help forward-secure digital signatures, our solution makes sure superseded possibly compromised configurations harmless, slow cannot fooled into reading stale data, cause denial by flooding system requests. Our approach modular based dynamic lattice agreement abstraction, discuss how extend implementations large class services.