Just after 2:30 p.m. on Dec. 23, 2015, a freezing day in Western Ukraine, an unknown hacker logged in to the Ivano-Frankivsk’s computerized electrical grid control center and, in a few seconds, abruptly shut down all electricity to the area’s 225,000 residents. The effects were immediate and far reaching. Traffic lights turned off. Televisions powered down. As night fell, the area plunged into darkness — no lights, no heat. It was a complete blackout.
