For decades, security strategy in many organisations has revolved around a simple principle: keep the threat out. Build strong fences. Lock the doors. Install cameras. Encrypt the servers. The idea being that if you stop the intruder at the perimeter, the rest will take care of itself. But in today’s threat landscape, rife with insider risks, cyber-physical convergence, and intelligent adversaries, that mindset is not only outdated, it’s dangerous. The real world is not binar