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Security Architecture

Security Architecture (Secure by Design)

Build resilient systems that withstand adversarial threats

Overview​

Security isn't added at the end; it's woven into architecture from day one. Secure by Design means:

  • Principles first: CIA triad, zero trust, least privilege, defense in depth shape decisions
  • Threat-aware: Identify assets, attack surfaces, trust boundaries before designing
  • Resilient: Assume breaches will happen; minimize damage and enable recovery
  • Proactive: Threat model, attack surface analysis, and red teaming reveal vulnerabilities

This section covers security architecture at scale:

Key Areas​

  • Principles & Models: CIA triad, zero trust, least privilege, separation of duties, defense in depth, secure defaults, complete mediation, fail securely
  • Threat Modeling: STRIDE, LINDDUN, PASTA frameworks for identifying threats systematically
  • Assets & Attack Surfaces: What are you protecting? Where are the weak points?
  • Identity & Access: Authentication, authorization, roles, policies
  • Data Protection: Encryption, key management, data classification
  • Network Security: Segmentation, firewalls, DDOS protection
  • Application Security: Input validation, injection prevention, secure coding
  • Operations: Incident response, compliance, monitoring, penetration testing

Security architecture is not a feature or a checkbox. It's a mindset: assume the worst, design for resilience, and continuously improve.