What is Zero Trust?
Zero Trust is a security framework that operates on the principle that no user, device, or network should be automatically trusted, regardless of whether they are inside or outside the organization's network perimeter. Every access request must be verified, validated, and authorized before granting access.
Core Principles
- Verify explicitly: Always authenticate and authorize based on all available data points
- Use least privilege access: Limit user access with just-in-time and just-enough-access
- Assume breach: Minimize blast radius and segment access; verify end-to-end encryption
Key Components
- Identity verification: Strong authentication including multi-factor authentication
- Device health: Verify device compliance and security posture before granting access
- Micro-segmentation: Divide networks into small, isolated segments
- Least privilege: Grant minimum necessary access rights
- Continuous monitoring: Real-time monitoring of all access and activities
Application in OT Environments
Implementing Zero Trust in OT environments presents unique challenges due to legacy systems, proprietary protocols, and availability requirements. Organizations must balance security controls with operational needs, often using a phased approach.
Benefits
Zero Trust architecture significantly reduces the attack surface, limits lateral movement by attackers, improves visibility into network activity, and provides a stronger security posture than traditional perimeter-based approaches.
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