TL;DR: by law, German power stations are required to "turn off" (taken off the energy grid) when they receive specific radio messages. This is intended for energy grid load balancing.<p>Unfortunately, the message protocol is completely flawed security-wise, which allows malicious actors to control the power station.<p>It would require only a handful of strategically placed senders to control an estimated 20 gigawatt of load Germany-wide, causing havoc on the European energy grid (brown-out, cascading effects, etc.).<p>The security researchers followed a responsible disclosure towards the vendor, EFR, who reacted with sending letters from their lawyers.<p>Today's SPIEGEL online news magazine pre-talk report ( <a href="https://archive.is/p66as" rel="nofollow">https://archive.is/p66as</a> ) on this topic cites EFR that the proposed attack vector is not possible.<p>The security researchers therefore made the last minute decision to go full disclosure with today's talk to press on the urgency of the topic.