Efficient Privacy-Preserving User Tracking From Threshold Multi-Party Private Set Intersection

This research paper describes a new method for tracking users across multiple databases without exposing their private information. The method, called threshold multi-party private set intersection (T-MPSI, a technique where multiple parties can find matching data without revealing the full datasets to each other), improves the speed of existing approaches by 3 to 6 times, making privacy-preserving user tracking more practical for real-world deployment.