Secure Software Development

🔑 Key Takeaway: Security in the software development lifecycle (SDLC) is continuous—design, code, review, and repository controls—not a final gate before ship.

Secure software development integrates security work throughout the SDLC so software is designed, built, and maintained with enforceable controls—not only late audits. This framework covers coding standards, peer review practices, version control hardening, and design-time threat modeling.

It complements DevSecOps (pipeline automation), Supply Chain (dependencies and build integrity), Threat Modeling (broader modeling methods), and External Security Reviews (independent assessment).

Basics

• Shift decisions left: fix classes of defect cheaper in design and review than in production response.
• Standards without enforcement fail: branch protection, review requirements, and scanners must match written rules.
• Web3 raises stakes: smart contracts and frontends that touch wallets make many bugs irreversible asset loss.

What this framework covers

1. Secure Coding Standards and Guidelines: input validation, encoding, authz checks, error handling, least privilege in code, and secure data handling.
2. Code Reviews and Peer Audits: review cadence, checklists, automation assist, and collaborative peer audit culture.
3. Secure Code Repositories and Version Control: access control, multi-factor authentication (MFA), branch protection, audit logs, commit signing, backups, CI/CD security checks.
4. Threat Modeling and Secure Design Principles: asset/threat/risk/mitigation loops and durable design principles.

Related frameworks

• Threat Modeling: dedicated modeling workflow and depth
• DevSecOps: pipeline security and automation
• Supply Chain: dependency and build artifact integrity
• Security Testing: dynamic and specialized testing beyond review
• Security Automation: continuous policy and scan automation
• External Security Reviews: third-party audits and assessments

Further Reading

• OWASP Secure Coding Practices
• OWASP Application Security Verification Standard
• NIST SSDF (SP 800-218)