Explore a conference talk on Persistent Fault Analysis (PFA), a novel attack technique targeting block ciphers. Delve into the research presented at CHES 2018 by Fan Zhang and colleagues, examining the principles of active fault attacks, optimal attack positions, and potential countermeasures. Gain insights into the experimental setup, key findings, and conclusions drawn from this groundbreaking study. Discover the implications for cryptographic security and learn about future research directions in this critical area of cybersecurity.