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New Cryptographic Primitive: Doubly Homomorphic Secure Aggregation (DHSA)

# New Cryptographic Primitive: Doubly Homomorphic Secure Aggregation (DHSA) **Overview** As of mid-2026, a notable new cryptographic primitive proposed for federated learning is the Doubly Homomorphic Secure Aggregation (DHSA) protocol. Introduced in a 2022 paper, DHSA enables efficient and secure aggregation of model updates in cross-silo federated learning scenarios. It combines additive and multiplicative homomorphic properties to support more complex aggregation functions while maintaining data privacy, addressing limitations of prior homomorphic encryption-based secure aggregation methods. ## Key Findings - The DHSA protocol is designed for cross-silo federated learning, where a small number of powerful i...

Source: https://arxiv.org/abs/2208.07189v1