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0x40Lesson 5 of 6

Build security into development

Use threat modeling, safe defaults, dependency care, and focused testing.

13 min 5-question quiz
By the end of this lesson you can
  • Choose practical security checks at design, implementation, and release time.

Secure development begins with design. Threat modeling asks what needs protection, who may attack, where trust boundaries lie, and how abuse could happen. Secure defaults deny access unless it is explicitly granted. Code review, static analysis, dependency scanning, and focused security tests can find different classes of problems; none proves that software is secure. Keep secrets out of source control and use managed secret storage with limited access.

Python simulation · illustrative only
checks = ["review access rules", "scan dependencies", "test denied requests"]
for check in checks:
    print("release check:", check)
Output
release check: review access rules
release check: scan dependencies
release check: test denied requests

Security tools can produce false positives and miss context-specific flaws. Assign owners to findings, fix issues based on risk, and verify intended protections in the deployed configuration.

Key takeaways

  • Ask security questions during design.

  • Use least privilege and deny-by-default settings.

  • Treat scanners as signals, not proof of safety.

Lesson quiz

5 questions · pass with 4 correct · up to 50 XP

Passing this quiz completes the lesson and keeps your streak going. Questions you miss come back in review sessions later.

Questions about this lesson

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