My personal history in cybersecurity began in the very early days of the commercialization of the nascent Internet. I started out as a firewall guy in 1992, primarily because my customers relied on firewalls to protect their network perimeters. Firewall implementation was underpinned by a simple principle: trust the internal network and distrust the external. The default template for firewall policies was “Everything is denied except that which is explicitly allowed.” However, this binary tru...