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The authors address the problem of emulating a shared read/write memory in a message passing system using a storage server prone to Byzantine failures. Although cryptography can be used to ensure confidentiality and integrity of the data, nothing can prevent a malicious server from returning obsolete data. Fork-linearizability guarantees that if a malicious server hides an update of some client from another client, then these two clients will never see each others' updates again. Fork-linearizability is arguably the strongest consistency property attainable in the presence of a malicious server. Recent work has shown that there is no fork-linearizable shared memory emulation that supports wait-free operations.
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