This guide explains the NIST Secure Software Development Framework (SSDF) and its role in improving software security and regulatory compliance. It outlines the impact of Executive Order 14028, requiring organizations to attest to secure development practices, and details the four core SSDF activities: preparing the organization, protecting software, producing secure code, and responding to vulnerabilities. The guide highlights the need for consistent processes, asset visibility, SBOM usage, and secure development environments. It also discusses common gaps such as weak training, inconsistent policies, and immature vulnerability management. Overall, it positions SSDF as a structured approach to reducing risk, improving resilience, and standardizing security across the software lifecycle.

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