Quantifying Membership Inference Vulnerability via Generalization Gap and Other Model Metrics

11 Sep 2020  ·  Jason W. Bentley, Daniel Gibney, Gary Hoppenworth, Sumit Kumar Jha ·

We demonstrate how a target model's generalization gap leads directly to an effective deterministic black box membership inference attack (MIA). This provides an upper bound on how secure a model can be to MIA based on a simple metric. Moreover, this attack is shown to be optimal in the expected sense given access to only certain likely obtainable metrics regarding the network's training and performance. Experimentally, this attack is shown to be comparable in accuracy to state-of-art MIAs in many cases.

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