Bolting security on at the end never works. True security requires embedding security practices into every phase of the software development lifecycle from day one.
Secure Design Phase
Conduct threat modeling during design reviews. Identify trust boundaries and attack surfaces. Apply security principles: least privilege, defense in depth, fail securely. Document security requirements alongside functional requirements.
Secure Development
Use secure coding standards and linters. Implement pre-commit hooks for secret scanning. Require security-focused code reviews. Provide security training for developers. Use parameterized queries, validated inputs, and proper authentication.
Automated Security Testing
Integrate SAST (static analysis) into your CI pipeline. Run DAST (dynamic analysis) in staging environments. Scan dependencies for known vulnerabilities. Fail builds that introduce critical security issues.
Production Security
Implement runtime application self-protection (RASP). Deploy web application firewalls. Monitor for suspicious activity patterns. Maintain an incident response playbook. Conduct regular penetration testing.
Conclusion
Security by default means security is never an afterthought. By integrating security into your SDLC, you catch vulnerabilities early when they're cheapest to fix and build security into your team's DNA.
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