Zero Trust Architecture: "Never Trust, Always Verify"
Architect modern perimeterless enterprise security: The BeyondCorp model, eliminating VPN lateral movement, mutual TLS (mTLS) with SPIFFE/SPIRE workload identities, continuous context-aware authorization, and network micro-segmentation.
01.1. The Death of the "Castle-and-Moat" Perimeter Security Model
For decades, enterprise security followed the Castle-and-Moat architecture:
- Build a hard exterior firewall and VPN ("the moat").
- Anyone inside the corporate office Wi-Fi or connected via VPN is considered trusted.
Why Castle-and-Moat Failed Catastrophically:
- Lateral Movement: Once an attacker compromised a single non-critical laptop via phishing or compromised a contractor's VPN credential, they found themselves inside the "trusted" network. From there, they could scan internal IP subnets, exploit unpatched internal servers, and dump database tables without resistance.
- The Modern Distributed Reality: Modern organizations operate across multi-cloud environments (AWS, GCP, Azure), SaaS platforms (Salesforce, GitHub), and distributed remote workforces. There is no longer a single physical perimeter to defend.
Castle-and-Moat vs Zero Trust Architecture 🏰
Castle-and-Moat vs Zero Trust Architecture 🏰
Replacing perimeter implicit trust with continuous identity verification, device health checks, and end-to-end mTLS.
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