Carefully Blending Adversarial Training and Purification Improves Adversarial Robustness

• URL: http://arxiv.org/abs/2306.06081v4
• Date: Thu, 23 May 2024 04:01:22 GMT
• Title: Carefully Blending Adversarial Training and Purification Improves Adversarial Robustness
• Authors: Emanuele Ballarin, Alessio Ansuini, Luca Bortolussi,
• Abstract summary: CARSO is able to defend itself against adaptive end-to-end white-box attacks devised for defences. Our method improves by a significant margin the state-of-the-art for CIFAR-10, CIFAR-100, and TinyImageNet-200.
• Score: 1.2289361708127877
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: In this work, we propose a novel adversarial defence mechanism for image classification - CARSO - blending the paradigms of adversarial training and adversarial purification in a synergistic robustness-enhancing way. The method builds upon an adversarially-trained classifier, and learns to map its internal representation associated with a potentially perturbed input onto a distribution of tentative clean reconstructions. Multiple samples from such distribution are classified by the same adversarially-trained model, and an aggregation of its outputs finally constitutes the robust prediction of interest. Experimental evaluation by a well-established benchmark of strong adaptive attacks, across different image datasets, shows that CARSO is able to defend itself against adaptive end-to-end white-box attacks devised for stochastic defences. Paying a modest clean accuracy toll, our method improves by a significant margin the state-of-the-art for CIFAR-10, CIFAR-100, and TinyImageNet-200 $\ell_\infty$ robust classification accuracy against AutoAttack. Code, and instructions to obtain pre-trained models are available at https://github.com/emaballarin/CARSO .

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