SecAgg++: A Post-Quantum Privacy Preserving Federated Learning Protocol

Alessandro Perez; Giulia Cavicchioni; Silvio Cretti; Riccardo Longo; Alessandro Tomasi; Silvio Ranise

Paper 2026/2497

SecAgg++: A Post-Quantum Privacy Preserving Federated Learning Protocol

Alessandro Perez

, Fondazione Bruno Kessler

Giulia Cavicchioni

, Fondazione Bruno Kessler

Silvio Cretti, Fondazione Bruno Kessler

Riccardo Longo

, Fondazione Bruno Kessler

Alessandro Tomasi

, Fondazione Bruno Kessler

Silvio Ranise

, Fondazione Bruno Kessler, University of Trento

Abstract

Secure aggregation is a fundamental building block for privacy-preserving federated learning, yet most existing masking-based secure aggregation protocols do not provide post-quantum security. In this work, we present SecAgg++, a masking-based post-quantum secure aggregation protocol for the single-server setting. SecAgg++ integrates post-quantum cryptographic primitives while preserving the communication and computational efficiency of classical frameworks such as SecAgg and SecAgg+, and supports client dropout handling through an efficient recovery procedure.

Metadata

Available format(s): PDF
Category: Applications
Publication info: Published elsewhere. AISec: 19 th ACM Workshop on Artificial Intelligence and Security
DOI: 10.1145/3847352.3848087
Keywords: Secure Aggregation Post-Quantum Cryptography Federated Learning Secret Sharing Additive Masking
Contact author(s): aperez @ fbk eu
gcavicchioni @ fbk eu
scretti @ fbk eu
rlongo @ fbk eu
altomasi @ fbk eu
ranise @ fbk eu
History: 2026-10-15: approved; 2026-10-15: received; See all versions
Short URL: https://ia.cr/2026/2497
License: CC BY

BibTeX

@misc{cryptoeprint:2026/2497,
      author = {Alessandro Perez and Giulia Cavicchioni and Silvio Cretti and Riccardo Longo and Alessandro Tomasi and Silvio Ranise},
      title = {{SecAgg}++: A Post-Quantum Privacy Preserving Federated Learning Protocol},
      howpublished = {Cryptology {ePrint} Archive, Paper 2026/2497},
      year = {2026},
      doi = {10.1145/3847352.3848087},
      url = {https://eprint.iacr.org/2026/2497}
}