Zero trust security assumes no implicit trust, whether inside or outside the network perimeter. This guide covers implementing zero trust principles in modern applications.
Core Principles
┌─────────────────────────────────────────────────────┐
│ ZERO TRUST │
├─────────────────────────────────────────────────────┤
│ 1. Verify Explicitly │
│ Authenticate and authorize every request │
├─────────────────────────────────────────────────────┤
│ 2. Least Privilege Access │
│ Grant minimum permissions needed │
├─────────────────────────────────────────────────────┤
│ 3. Assume Breach │
│ Minimize blast radius, segment access │
└─────────────────────────────────────────────────────┘
Authentication
JWT Implementation
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Multi-Factor Authentication
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Authorization
Role-Based Access Control (RBAC)
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Attribute-Based Access Control (ABAC)
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API Security
Request Validation
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Security Headers
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Service-to-Service Security
mTLS Authentication
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Service Mesh (Istio example)
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Secrets Management
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Audit Logging
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Best Practices
- Never trust client input: Validate and sanitize everything
- Encrypt data at rest and in transit: Use TLS everywhere
- Implement defense in depth: Multiple security layers
- Log security events: Maintain audit trails
- Regular security reviews: Penetration testing, code audits
- Principle of least privilege: Minimum necessary permissions
- Rotate secrets regularly: Automate credential rotation
Conclusion
Zero trust requires continuous verification at every layer. Start with strong authentication and authorization, secure service-to-service communication, and maintain comprehensive audit logs. Security is not a feature—it's a continuous practice.