This Project Grant from the National Science Foundation Division of Computing and Communication Foundations, under the Computer and Information Science and Engineering federal grant program (CFDA 47.070), provides $599,467 to the University of Illinois to develop a systematic framework for testing, diagnosing, repairing, and strengthening physically unclonable functions. Physically unclonable functions are electronic hardware security primitives still in early development and investigation stages. This award will train students and develop new statistical models, techniques, and tools to enable reliable mass production and integration of physically unclonable functions into security applications by addressing manufacturing faults. Specifically, the University of Illinois will work to devise methods for accurately identifying production line and aging faults in physically unclonable functions, and to repair unreliable devices, through January 2025. This research aims to help realize the promise of physically unclonable functions for trusted integrated circuit design and verification.