Back in 2012, then-defense secretary Leon Panetta warned of a catastrophic cyber attack that could cripple an entire nation or its military. He called it a cyber Pearl Harbor. It was emblematic of a lot of the conventional wisdom that’s built up around cyber warfare over the past decade or so. In a recent op-ed, Jay Healey challenges some of that conventional wisdom. Healy is director of Cyber Statecraft Initiative at the Atlantic Council. On In Depth with guest host Jared Serbu, he argued not only is deterrence possible in cyberspace, it’s been a reality for a couple decades now.