37C3 - Breaking "DRM" in Polish trains

MrTick and Redford explain how they reverse-engineered Polish electric trains to bypass software lockouts implemented by the manufacturer.

media.ccc.de/v/37c3-12142-breaking_drm_in_polish_trains Reverse engineering a train to analyze a suspicious malfunction We've all been there: the trains you're servicing for a customer suddenly brick themselves and the manufacturer claims that's because you've interfered with a security system. This talk will tell the story of a series of Polish EMUs (Electric Multiple Unit) that all refused to move a few days after arriving at an “unauthorized” service company. We'll go over how a train control system actually works, how we reverse-engineered one and what sort of magical “security” systems we actually found inside of it. Reality sometimes is stranger than the wildest CTF task. Reality sometimes is running `unlock.py` on a dozen trains. The talk will be a mix of technical and non-technical aspects of analysis which should be understandable for anyone with a technical background. We’ll briefly explain how modern EMUs look like inside, how the Train Control & Monitoring System works, and how to analyze TriCore machine code. Redford q3k MrTick events.ccc.de/congress/2023/hub/event/breaking_drm_in_polish… #37c3 #HardwareMaking