Taiwan student halts high-speed trains by spoofing 19-year-old TETRA signals

A 23-year-old in Taiwan, identified by his surname Lin, brought four Taiwan High Speed Rail trains to an emergency stop for 48 minutes on April 5 by transmitting a forged ‘General Alarm’ on the network’s TETRA radio system. Using a software-defined radio bought online, he intercepted and decoded the network’s TETRA parameters, then loaded them into handheld radios to impersonate a legitimate beacon. A 21-year-old accomplice supplied additional THSR-specific parameters needed to make the spoof land.

The attack worked because THSR had run the same TETRA configuration for 19 years without rotating keys or parameters, letting a single capture defeat seven layers of verification. THSR caught the anomaly when logs showed the alarm originating from a beacon ID not assigned for duty that day, and CCTV plus network logs led police to Lin’s residence, where they seized 11 handhelds, an SDR, and a laptop.

Lin was arrested April 28 and charged under Article 184 of Taiwan’s Criminal Law, carrying up to 10 years; he is out on NT$100,000 (~$3,280) bail. His lawyer claims the transmission was accidental — a defense investigators reject. The case has drawn political criticism over operator negligence on a network carrying 81.8 million passengers a year at speeds up to 300 km/h.