This article provides a technical and operational checklist for IT teams, developers and security owners who need to demonstrate adoption of security by design and by default. Each item lists minimum controls, measurement methods and documentary evidence useful for audits or compliance reviews.

Why a practical checklist? Security by design requires turning regulatory principles and best practices into concrete, repeatable and verifiable controls. Regulators and auditors expect evidence that technical choices were assessed, implemented and maintained over time — assertions alone are not enough.

Governance and responsibilities

  • Assign clear roles and responsibilities (e.g., application security owner, data protection officer, DevOps lead). Evidence: updated organization chart and signed role assignments.
  • Publish versioned security policies and operational playbooks. Evidence: internal repository with policy files and revision history.
  • Document decision-making for security vs. functionality trade-offs (technical decision log).

Risk assessment and security requirements

  • Perform threat modeling before major project milestones. Minimum control: a maintained threat model mapped to releases.
  • Map processed data and apply data minimization. Evidence: data inventory and classification.
  • Define traceable security requirements (authentication, encryption, logging) linked to development tickets.

Secure SDLC and DevOps integration

  • Integrate static code analysis (SAST) into CI/CD with fail thresholds for critical categories. Evidence: CI pipelines and retained SAST reports.
  • Run dynamic security testing (DAST) and dependency scans (software composition analysis) before production pushes.
  • Maintain a vulnerability management policy with measurable SLAs and a remediation log.

Identity, authentication and authorization

  • Enforce strong authentication (MFA) for administrative access and privileged accounts. Evidence: MFA configurations and coverage percentages.
  • Apply least privilege across roles; use role-based access control and environment separation.
  • Centralize secret and key management with auditable access and automated rotation.

Data protection

  • Encrypt data at rest and in transit with industry-accepted algorithms and parameters. Evidence: configuration snapshots and certificates.
  • Apply pseudonymization/ anonymization where applicable and minimize personal data collection.
  • Implement secure backups and periodically test restores; document recovery tests.

Network and infrastructure

  • Network segmentation to isolate development, test and production environments.
  • Configure network controls to limit attack surface (default-deny principle).
  • Harden images and containers: baseline configuration checklist, signed base images, and pre-deployment scanning.

Supply chain and third parties

  • Maintain an inventory of software and service providers with risk ratings.
  • Include contractual clauses requiring minimum security controls and audit rights.
  • Monitor third-party dependencies continuously and maintain a Software Bill of Materials (SBOM).

Logging, monitoring and detection

  • Log essential security events (privileged access, critical changes, authentication failures) with immutability for auditability.
  • Implement continuous monitoring and alerting on key indicators; retain logs according to retention policy.
  • Prepare forensic acquisition procedures and validated tools for evidence collection.

Incident management and resilience

  • Maintain an incident response plan and conduct regular exercises with documented reports.
  • Define and test business continuity and disaster recovery procedures.
  • Establish communication and escalation paths for internal and external stakeholders.

Testing, verification and audit

  • Run regular penetration tests, configuration checks and post-release evaluations.
  • Undertake independent verification (internal audit or third party) and formally address findings.
  • Include a security quality gate checklist with every release.

Documentation and evidence for compliance

  • Bundled evidence per system: architecture diagrams, threat models, SAST/DAST reports, pentest results, decision logs and applied policies.
  • Maintain a log of maintenance activities, patching and backups accessible for audits.
  • Present metrics and dashboards showing security posture: percent of components scanned, average remediation time, MFA coverage, etc.

Quick checklist (minimum verifiable controls)

  • Documented roles and policies
  • Updated threat model
  • SAST/DAST in CI/CD
  • MFA for privileged accounts
  • Encryption at rest and in transit
  • Immutable logging and monitoring
  • SBOM and vendor management
  • Tested incident response plan
  • Pentest report and remediation follow-up

Conclusion This checklist does not replace a full risk assessment but provides a set of technical controls and processes that can be quickly adopted and measured to demonstrate security by design and by default. For each item, prepare repeatable evidence and a decision log: documentation often determines the outcome of audits and compliance checks.