Defense In Depth Architecture

A single-layer defense is a single point of failure. In today’s threat landscape, Operational Technology environments require a layered security model that goes beyond perimeter firewalls. Arista Cyber delivers Defense-in-Depth (DiD) architecture tailored for industrial control systems integrating physical, network, endpoint, identity, and monitoring controls. Our solutions are mapped to IEC 62443, NIST SP 800-82, and the Purdue Model, ensuring segmentation, redundancy, and resilience are built into every layer of your OT infrastructure.

Key Advantages

1. Reduced attack surface through enforced segmentation and isolation
2. Layered controls to prevent lateral movement and privilege escalation
3. Aligned with IEC 62443, NIST CSF, and industry best practices
4. Operational continuity preserved through safe, non-disruptive architecture
5. Visibility and control from field level to enterprise boundary

LAYERED DEFENSES ARE NOT OPTIONAL THEY ARE OPERATIONAL TECHNOLOGY’S BACKBONE

Deliverables

1. Custom Defense-in-Depth blueprint tailored to your OT architecture
2. Purdue Model–aligned segmentation and trust zone definitions
3. Integrated security control stack across all DiD layers:
   • Physical → Network → Endpoint → Identity → Application → Monitoring
4. Integration support for firewalls, DMZs, industrial IDS, and access systems

Our Approach

We start by modeling your OT environment identifying zones, conduits, trust boundaries, and control system components. Using a zero-trust mindset, we architect layered defenses that prevent, detect, and contain threats at every level. Our team designs granular segmentation, access control, intrusion detection, and device hardening strategies ensuring controls complement each other, rather than operate in silos. Each recommendation is operationally safe, standards-aligned, and implementation-ready.