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arXiv · 2003.01908

Denoised Smoothing: A Provable Defense for Pretrained Classifiers

Hadi Salman·Mingjie Sun·Greg Yang·Ashish Kapoor·J. Zico Kolter
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Abstract

We present a method for provably defending any pretrained image classifier against $\ell_p$ adversarial attacks. This method, for instance, allows public vision API providers and users to seamlessly convert pretrained non-robust classification services into provably robust ones. By prepending a custom-trained denoiser to any off-the-shelf image classifier and using randomized smoothing, we effectively create a new classifier that is guaranteed to be $\ell_p$-robust to adversarial examples, without modifying the pretrained classifier. Our approach applies to both the white-box and the black-box settings of the pretrained classifier. We refer to this defense as denoised smoothing, and we demonstrate its effectiveness through extensive experimentation on ImageNet and CIFAR-10. Finally, we use our approach to provably defend the Azure, Google, AWS, and ClarifAI image classification APIs. Our code replicating all the experiments in the paper can be found at: https://github.com/microsoft/denoised-smoothing.

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Hadi Salman, Mingjie Sun, Greg Yang, Ashish Kapoor, J. Zico Kolter. 2020-09-21. Denoised Smoothing: A Provable Defense for Pretrained Classifiers. https://arxiv.org/abs/2003.01908

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