Recently researchers have studied input leakage problems in Federated
Learning (FL) where a malicious party can reconstruct sensitive training inputs
provided by users from shared gradient. It raises concerns about FL since input
leakage contradicts the privacy-preserving intention of using FL. Despite a
relatively rich literature on attacks and defenses of input reconstruction in
Horizontal FL, input leakage and protection in vertical FL starts to draw
researcher’s attention recently. In this paper, we study how to defend against
input leakage attacks in Vertical FL. We design an adversarial training-based
framework that contains three modules: adversarial reconstruction, noise
regularization, and distance correlation minimization. Those modules can not
only be employed individually but also applied together since they are
independent to each other. Through extensive experiments on a large-scale
industrial online advertising dataset, we show our framework is effective in
protecting input privacy while retaining the model utility.

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