The ebook explains how the Cyber Defense Matrix, created by Sounil Yu, helps organizations align cybersecurity tools and processes to the NIST Cybersecurity Framework (Identify, Protect, Detect, Respond, Recover) by mapping them against five primary asset classes that get attacked: devices, networks, applications, data, and users. Unlike a checklist, the matrix is a planning and visibility tool that clarifies what NIST leaves open, showing where controls overlap and where gaps exist across “left of boom” prevention and “right of boom” detection and response. It defines each asset class and each NIST function, highlights that recovery often depends on people and process, and shows example mappings for incidents and disasters. The goal is to make security programs easier to assess, prioritiz

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