Hardening Confidential Federated Compute against Side-Channel Attacks

Albert Cheu
Adria Gascon
James Bell-Clark
Theory and Practice of Differential Privacy (2026)

Abstract

In this work, we identify a set of side-channels in our Confidential Federated Compute platform that a hypothetical insider could exploit to circumvent differential privacy (DP) guarantees. We show how DP can mitigate two of the side-channels, one of which has been implemented in our open-source library.
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