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Witchcraft: Efficient PGD Attacks with Random Step Size

Witchcraft: Efficient PGD Attacks with Random Step Size

State-of-the-art adversarial attacks on neural networks use expensive iterative methods and numerous random restarts from different initial points. Iterative FGSM-based methods without restarts trade off performance for computational efficiency because they do not adequately explore the image space and are highly sensitive to the choice of step size. We propose …