Explore a DEF CON conference talk that delves into the often-overlooked aspect of GPS spoofing - time manipulation and its critical implications for aviation security. Learn how time spoofing can cause digital certificate invalidation and communication failures in aircraft systems, potentially grounding entire fleets for weeks. Discover insights from a significant incident where forward time manipulation led to extensive system disruptions, requiring complete reflashing of aircraft systems. Understand the vulnerabilities in GPS clock protection mechanisms, particularly their lack of safeguards against forward time manipulation. Gain knowledge about conventional RF navaids' susceptibility to similar attacks and potential mitigation strategies. Through expert analysis from aviation security specialist Ken Munro, examine the broader implications of GPS time spoofing beyond just position manipulation, and its impact on connected aviation systems.