<ul data-eligibleForWebStory="true">Ensuring resilience to Byzantine clients while protecting the privacy of data in federated learning is a challenge.Existing secure aggregation techniques are effective when clients' data is homogeneous but fail for heterogeneous data.Pre-processing techniques like nearest neighbor mixing can enhance countermeasures in heterogeneous settings.Proposed multi-stage method combines secret sharing, secure aggregation, and private information retrieval for privacy and resilience.The method is designed to provide information-theoretic privacy guarantees and Byzantine resilience under data heterogeneity.Scheme outperforms previous techniques in combating various attacks in federated learning.Investigation into reducing communication overhead of secure aggregation through zero-order estimation methods.Efforts to make private aggregation scalable in state-of-the-art federated learning tasks.