>Poland's national transportation agency has stated its intention to upgrade Poland's railway systems by 2025 to use almost exclusively GSM cellular radios, whi

>Poland's national transportation agency has stated its intention to upgrade Poland's railway systems by 2025 to use almost exclusively GSM cellular radios, which do have encryption and authentication. But until then, it will continue to use the relatively unprotected VHF 150 MHz system that allows the “radio-stop” commands to be spoofed. https://www.wired.com/story/poland-train-radio-stop-attack/ https://www.wired.com/story/poland-train-radio-stop-attack/