Fail-safe engineering for autonomous systems has evolved beyond simple shutdown mechanisms to active resilience under degradation. The piece covers the convergence of functional safety (ISO 26262, ASIL levels), perception-based safety (ISO 21448/SOTIF), and cybersecurity (ISO/SAE 21434) as inseparable disciplines. Key themes include redundant sensing, graceful degradation, supervisory safety controllers, hardware-rooted security (secure boot, trusted execution environments), runtime monitoring, and the challenge of certifying AI-driven systems whose failures are probabilistic rather than deterministic. The author argues that safety and security co-design is now mandatory, as cyberattacks and hardware faults produce indistinguishable symptoms, and that continuous, scenario-based validation must replace traditional checkbox certification.
