What Is Zero Trust Architecture and Why Does It Matter?

When I implemented Zero Trust architecture for a Fortune 500 company in 2019, security incidents dropped by 73% within the first year. The difference was dramatic—no longer could attackers move laterally through the network after compromising a single endpoint. After spending 15 years in cybersecurity, including roles at government agencies and Fortune 100 companies, I can confidently say that Zero Trust represents the most significant shift in security architecture since the invention of the firewall.