This case study describes how one of the largest U.S. metropolitan governments recovered from a devastating ransomware attack caused by a flat, lateral network spanning more than 40 departments and unsupported legacy systems. To prevent future breaches, the City adopted zero-trust microsegmentation with ColorTokens, following a phased crawl-walk-run approach that prioritized staff training and gradual operational ownership. The solution isolated legacy infrastructure, reduced attack surfaces, limited blast radius, and restored compliance (including PCI). The result was a more resilient, segmented network that existing staff could manage independently, significantly lowering future cyber risk.

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