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On the Difficulty of Membership Inference Attacks

CVPR 2021 · Adversarial robustness and security › Attacks on text and graphs · approach: Membership inference and inversion · 72 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Report false alarm rate and balanced accuracy alongside positive-class metricsMI attack evaluation on CIFAR-100 with ResNet · CIFAR-100false alarm rate: 64.45%Hurt
Vary evaluation-set member:non-member ratio from 5:1 to 1:5the same MI attack model · evaluation-set balancednesspositive-class precision: 87.30% to 21.41%Hurt
Use ZeroR, which always predicts member, as a baselineMI attack evaluation · 5:1 member:non-member evaluation setpositive-class recall: MI Attack 87.85%; ZeroR 100.0%No clear effect
Use confidence values to infer membership of correctly classified samples rather than all samplesconfidence-based MI attacks · CIFAR-100, DenseNetattack accuracy: 66.65% to 60.58%Hurt
Use confidence values to infer membership of misclassified samplesconfidence-based MI attacks · CIFAR-100, DenseNetattack accuracy: 66.65% to 98.25% ± 9.2Helped
Use intermediate-layer outputs instead of confidence valuesMI attacks on ImageNet with InceptionV3 · ImageNet, all dataattack accuracy: 50.03% ± 0.28 to 58.37% ± 7.8Helped
Use decision-boundary distance as the membership featureMI attack on correctly classified CIFAR-100 DenseNet samples · CIFAR-100, correctly classifiedattack accuracy: 49.74% ± 6.41No clear effect
Use gradient norms instead of confidence valuesMI attack on correctly classified CIFAR-100 DenseNet samples · CIFAR-100, correctly classifiedfalse alarm rate: 77.17% ± 15.28 to 6.12% ± 3.6Helped
Use gradient information on misclassified samples rather than confidence valuesMI attacks · misclassified samplesmembership information leakageHurt
Train target models without early stopping, allowing overfittingCIFAR-10 and CIFAR-100 target models · correctly classified samplesMI attack accuracyNo clear effect
Train target models until overfitting beginsCIFAR-10 and CIFAR-100 target models · misclassified samplesMI attack accuracyHelped
Apply early stopping to target-model trainingCIFAR-10 and CIFAR-100 target models · membership inference on misclassified samplesMI attack successHurt

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