Toward More Practical Label Inference Attacks Against Graph-Based Vertical Federated Learning

This research paper describes a new attack called Knowledge Transfer Attack (KTA) that can steal private labels (the correct answers or classifications) from graph-based vertical federated learning (GVFL, a system where multiple parties collaborate on machine learning while keeping their data private). Unlike previous attacks that required unrealistic access to training data or labeled examples, KTA only needs auxiliary graphs from unrelated domains to infer the private labels, making it a more practical threat to real-world GVFL systems.