A malicious server can recover the main subject of a user's training image from a single LDP-protected gradient by inserting a reverse-index separation layer.
Deep leakage from gradients,
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Local Differential Privacy is Not Enough: A Sample Reconstruction Attack against Federated Learning with Local Differential Privacy
A malicious server can recover the main subject of a user's training image from a single LDP-protected gradient by inserting a reverse-index separation layer.