Decision-Based Adversarial Attacks: Reliable Attacks Against Black-Box Machine Learning Models
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Abstract (arXiv)
Many machine learning algorithms are vulnerable to almost imperceptible perturbations of their inputs. So far it was unclear how much risk adversarial perturbations carry for the safety of real-world machine learning applications because most methods used to generate such perturbations rely either on detailed model information (gradient-based attacks) or on confidence scores such as class probabilities (score-based attacks), neither of which are available in most real-world scenarios. In many such cases one currently needs to retreat to transfer-based attacks which rely on cumbersome substitute models, need access to the training data and can be defended against. Here we emphasise the importance of attacks which solely rely on the final model decision. Such decision-based attacks are (1) applicable to real-world black-box models such as autonomous cars, (2) need less knowledge and are easier to apply than transfer-based attacks and (3) are more robust to simple defences than gradient- or score-based attacks. Previous attacks in this category were limited to simple models or simple datasets. Here we introduce the Boundary Attack, a decision-based attack that starts from a large adversarial perturbation and then seeks to reduce the perturbation while staying adversarial. The attack is conceptually simple, requires close to no hyperparameter tuning, does not rely on substitute models and is competitive with the best gradient-based attacks in standard computer vision tasks like ImageNet. We apply the attack on two black-box algorithms from Clarifai.com. The Boundary Attack in particular and the class of decision-based attacks in general open new avenues to study the robustness of machine learning models and raise new questions regarding the safety of deployed machine learning systems. An implementation of the attack is available as part of Foolbox at https://github.com/bethgelab/foolbox .
Key facts. Cited by 459 papers in the map (data through 7 Oct 2026). First posted on arXiv 12 Dec 2017.
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Citing papers per year: 2021: 118; 2022: 90; 2023: 105; 2024: 62; 2025: 53; 2026: 31.
459 papers.
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- 2021Unsolved Problems in ML Safetycited by 291
- 2021Enhancing the Transferability of Adversarial Attacks through Variance Tuningcited by 242
- 2021On the Robustness of Vision Transformers to Adversarial Examplescited by 167
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- 2021Adversarial Sticker: A Stealthy Attack Method in the Physical Worldcited by 92
- 2022Improving Adversarial Transferability via Neuron Attribution-Based Attackscited by 92
- 2022Parallel Rectangle Flip Attack: A Query-based Black-box Attack against Object Detectioncited by 79
- 2023A Pilot Study of Query-Free Adversarial Attack against Stable Diffusioncited by 75
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- 2021Adversarial Robustness Comparison of Vision Transformer and MLP-Mixer to CNNscited by 57
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- 2023Boosting Adversarial Transferability by Achieving Flat Local Maximacited by 48
- 2024Erasing Undesirable Concepts in Diffusion Models with Adversarial Preservationcited by 48
- 2021Exploring Adversarial Robustness of Multi-Sensor Perception Systems in Self Drivingcited by 45
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- 2022A Survey of Robust Adversarial Training in Pattern Recognition: Fundamental, Theory, and Methodologiescited by 44
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- 2022Beyond ImageNet Attack: Towards Crafting Adversarial Examples for Black-box Domainscited by 42
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- 2026Large-scale Testing Global Optimization Methods with Black-box Adversarial Attacks13 Aug 2026
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- 2025Generating Transferrable Adversarial Examples via Local Mixing and Logits Optimization for Remote Sensing Object Recognition9 Sep 2025
- 2025DisarmRAG: Stealthy Retriever-Centric Poisoning to Disable Self-Correction in Retrieval-Augmented Generation (Extended Version)27 Aug 2025
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- 2023Boosting Black-box Attack to Deep Neural Networks with Conditional Diffusion Modelscited by 12
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- 2024Hiding and Recovering Knowledge in Text-to-Image Diffusion Models via Learnable Promptscited by 8
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- 2025Fantastic Targets for Concept Erasure in Diffusion Models and Where To Find Them31 Jan 2025
- 2024Erasing Undesirable Concepts in Diffusion Models with Adversarial Preservation21 Oct 2024
- 2024Classifier Guidance Enhances Diffusion-based Adversarial Purification by Preserving Predictive Information12 Aug 2024
- 2024Hiding and Recovering Knowledge in Text-to-Image Diffusion Models via Learnable Prompts18 Mar 2024
- 2023Boosting Black-box Attack to Deep Neural Networks with Conditional Diffusion Models11 Oct 2023
- 2023DiffDefense: Defending against Adversarial Attacks via Diffusion Models7 Sep 2023
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- 2025HV-Attack: Hierarchical Visual Attack for Multimodal Retrieval Augmented Generation19 Nov 2025
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- 2024Query-Based Adversarial Prompt Generation19 Feb 2024
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- 2021Enhancing the Transferability of Adversarial Attacks through Variance Tuningcited by 242
- 2021On the Robustness of Vision Transformers to Adversarial Examplescited by 167
- 2021Advances in adversarial attacks and defenses in computer vision: A surveycited by 127
- 2021Feature Importance-aware Transferable Adversarial Attackscited by 125
- 2022Shadows can be Dangerous: Stealthy and Effective Physical-world Adversarial Attack by Natural Phenomenoncited by 101
- 2021Adversarial Sticker: A Stealthy Attack Method in the Physical Worldcited by 92
- 2022Improving Adversarial Transferability via Neuron Attribution-Based Attackscited by 92
- 2022Parallel Rectangle Flip Attack: A Query-based Black-box Attack against Object Detectioncited by 79
- 2023How Deep Learning Sees the World: A Survey on Adversarial Attacks & Defensescited by 65
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- 2026REPLICANT: Learning Policies for Evading and Hardening Malware Detectors28 Aug 2026
- 2026Perspective-Invariant Attack with Enhanced Transferability of Adversarial Examples15 Aug 2026
- 2026Large-scale Testing Global Optimization Methods with Black-box Adversarial Attacks13 Aug 2026
- 2026Adversarial Attacks on Deep OCR Systems7 Aug 2026
- 2026Signal-based Model Access Risk Analysis for AI System Operations Security17 Jul 2026
- 2026Random Logit Scaling: Defending Deep Neural Networks Against Black-Box Score-Based Adversarial Example Attacks16 Jul 2026
- 2026Latent Geometric Chords for Query-Efficient Decision-Based Adversarial Attacks29 May 2026
- 2026MoCo-EA: Exploiting Adversarial Mode Connectivity for Efficient Evolutionary Attacks18 May 2026
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