Strategic Defense in Machine Learning: Assessing the Most Optimal Defense Approach to Mitigate Adversarial Cyber Attacks

In the era of AI proliferation, developing robust defense mechanisms against adversarial cyberattacks is critical. This project focuses on identifying and evaluating the most effective defense strategy to protect AI models from adversarial attacks. To mitigate overfitting, the baseline AI model was constructed with 2 convolutional layers, a dense layer of 256 nodes, pooling, and dropout layers. This foundational model demonstrated exceptional proficiency, achieving a 99.5% accuracy rate on the Modified National Institute of Standards and Technology (MNIST) dataset. The next three defense methodologies: adversarial training (integrating perturbed images into the training regimen), defensive distillation (employing softened probability distributions to enhance data generalization), and gradient masking (nullifying unused gradients to obscure potential attack vectors) were explored. Each method was applied to train distinct defenseaugmented versions of the AI control model. The effectiveness of these defense strategies was tested against the Fast Gradient Sign Method (FGSM) attack which manipulates test images to deceive AI models. Each defense-enhanced model was evaluated based on its ability to maintain accuracy in the face of these cyberattacks. This analysis aims to contribute significantly to the field of AI cybersecurity, offering insights into the most viable strategies for safeguarding AI systems against sophisticated adversarial threats.