The Capacity of Information-Theoretic Secure Aggregation
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The Capacity of Information-Theoretic Secure Aggregation in Federated Learning
Announce Type: new Abstract: Secure aggregation allows a server to aggregate users' local updates while preserving update privacy. Existing information-theoretic problems typically assume that correlated random keys are provided by a trusted third party (TTP) or generated via prescribed groupwise structures, while the communication cost for establishing such correlated keys is often ignored. Consequently, the fundamental limits under general key-distribution mechanisms remain unknown.