Enhancing can security with ML-based IDS: Strategies and efficacies against adversarial attacks

Control Area Networks (CAN) face serious security threats recently due to their inherent vulnerabilities and the increasing sophistication of cyberattacks targeting automotive and industrial systems. This paper focuses on enhancing the security of CAN, which currently lack adequate defense mechanisms. We propose integrating Machine Learning-based Intrusion Detection Systems (ML-based IDS) into the network to address this vulnerability. However, ML systems are susceptible to adversarial attacks, leading to misclassification of data. We introduce three defense combination methods to mitigate this risk: adversarial training, ensemble learning, and distance-based optimization. Additionally, we employ a simulated annealing algorithm in distance-based optimization to optimize the distance moved in feature space, aiming to minimize intra-class distance and maximize the inter-class distance. Our results show that the ZOO attack is the most potent adversarial attack, significantly impacting model performance. In terms of model, the basic models achieve an F1 score of 0.99, with CNN being the most robust against adversarial attacks. Under known adversarial attacks, the average F1 score decreases to 0.56. Adversarial training with triplet loss does not perform well, achieving only 0.64, while our defense method attains the highest F1 score of 0.97. For unknown adversarial attacks, the F1 score drops to 0.24, with adversarial training with triplet loss scoring 0.47. Our defense method still achieves the highest score of 0.61. These results demonstrate our method's excellent performance against known and unknown adversarial attacks.