Privacy Leakage in Federated Learning: Client Identity Inference and Defenses for Inertial Sensing in Vehicular Networks
Federated learning is widely heralded as privacy-preserving because raw sensor data never leaves the edge. This paper presented at IEEE VTC 2026 reveals that undefended weight deltas allow an honest-but-curious server to identify clients with near-perfect accuracy (≈1.000), and formulates rigorous clip-then-noise and ensemble defenses with formal (ε, δ)-DP guarantees.


















