Back in 2014, when I was managing Tofino Security, I became very interested in the Dragonfly attacks against industrial control systems (ICS). I was particularly fascinated with the ways that the attackers exploited the trust between ICS suppliers and their customers. Frankly, this scared me because, as I will explain, I knew that all the firewalls, antivirus, whitelisting, and patching in the world would do little to protect us from this threat.