When a Radio Signal Stops a Train

A Taiwan high-speed rail incident from earlier this week is a sharp reminder that RF security is not a niche issue. It is part of critical infrastructure resilience. Image 1: Taiwan High Speed Rail — THSR 700T train on the Taipei–Kaohsiung line. Source: Wikimedia Commons Reports confirm a university student used consumer-grade SDR equipment to intercept, decode and clone TETRA radio parameters, then triggered a General Alarm signal that brought four high-speed trains to an emergency stop for 4...