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Abstract
Scientific collaborations benefit from collaborative learning of distributed
sources, but remain difficult to achieve when data are sensitive. In recent
years, privacy preserving techniques have been widely studied to analyze
distributed data across different agencies while protecting sensitive
information. Most existing privacy preserving techniques are designed to resist
semi-honest adversaries and require intense computation to perform data
analysis. Secure collaborative learning is significantly difficult with the
presence of malicious adversaries who may deviates from the secure protocol.
Another challenge is to maintain high computation efficiency with privacy
protection. In this paper, matrix encryption is applied to encrypt data such
that the secure schemes are against malicious adversaries, including chosen
plaintext attack, known plaintext attack, and collusion attack. The encryption
scheme also achieves local differential privacy. Moreover, cross validation is
studied to prevent overfitting without additional communication cost. Empirical
experiments on real-world datasets demonstrate that the proposed schemes are
computationally efficient compared to existing techniques against malicious
adversary and semi-honest model.