NIST 800-171 3.13.2: Security Engineering Principles
Security engineering principles form the foundation of resilient systems by embedding protection directly into architectural design and development practices. Rather than treating security as an afterthought, this control requires organizations to integrate threat analysis, secure design patterns, and engineering rigor throughout the system lifecycle. For SMBs handling controlled unclassified information, adopting these principles early reduces costly security rework and strengthens your compliance posture.
What this means
This control mandates that your organization employ architectural designs, software development techniques, and systems engineering principles specifically intended to promote effective information security. Rather than relying solely on perimeter defenses, you must demonstrate that security considerations are embedded in how systems are designed, built, and evolved. This includes threat modeling during design phases, secure coding practices during development, and continuous integration of security controls throughout the system lifecycle.
How to comply
- 1.Conduct threat modeling and security architecture reviews before initiating system design
- 2.Establish secure development standards covering code review, testing, and dependency management
- 3.Implement design patterns that separate security-critical functions from general processing
- 4.Use defense-in-depth principles to layer security controls throughout system architecture
- 5.Document architectural decisions and security rationale for audit and future reference
- 6.Train development teams on secure coding practices and security-first design thinking
- 7.Perform security testing at each development phase, not just at the end
- 8.Review and update security engineering practices annually or when systems change significantly
Evidence auditors look for
- Security architecture documentation showing threat models and design decisions
- Secure development guidelines and standards adopted by the organization
- Code review processes demonstrating security-focused evaluation criteria
- System design diagrams annotating security controls and their placement
- Training records showing developers completed security engineering courses
- Security testing results from design phase, development phase, and integration testing
- Change management records reflecting security review of architectural changes
- Risk assessments tied to specific architectural design choices
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automates security engineering documentation, tracks threat model updates, maintains secure development standards, and generates evidence trails for NIST 800-171 3.13.2 audits—reducing manual overhead while ensuring engineering practices remain visible and auditable.
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