Taiwan Student Disrupts High-Speed Rail with Radio Hack

• •A university student halted four high-speed trains in Taiwan using a radio hack.
• •The attack exploited outdated TETRA communication parameters, allowing unauthorized access.
• •Lin faces up to 10 years in prison, highlighting serious security vulnerabilities in rail systems.

A 23-year-old university student in Taiwan, surnamed Lin, was arrested for halting four high-speed trains for 48 minutes on April 5, 2026. He used software-defined radio (SDR) equipment to transmit a false General Alarm signal, triggering emergency braking procedures on the Taiwan High-Speed Rail (THSR) network. The attack exploited a vulnerability in the TETRA communication system, which had not updated its parameters in 19 years, allowing Lin to bypass multiple security layers. Police discovered that Lin had decoded TETRA parameters and cloned signals using equipment purchased online. An accomplice provided critical parameters for the attack. Lin faces potential imprisonment of up to 10 years under Taiwan's Criminal Law and is currently out on NT$100,000 ($3,280) bail. The incident has raised concerns about the safety and security of critical infrastructure in Taiwan.