OT Security Architecture Analysis
78% of industrial attacks exploit weak IT/OT segmentation. We'll design security architecture that protects production without downtime. You get defense in depth compliant with industrial standards.
What is OT Security Architecture Analysis?
OT Security Architecture Analysis is a passive review of an existing industrial network that identifies segmentation gaps, flat-network risks, and deviations from the Purdue Model and IEC 62443-3-3 security zones — without interrupting production. nFlo delivers a detailed segmentation design, Industrial DMZ blueprint, and a prioritized implementation roadmap; 78% of industrial attacks exploit the absence of IT/OT separation.
Flat OT network is an open door for attackers
Secure OT architecture from ground up
Segmentation
Division into security zones by function
Defense in Depth
Multi-layered OT system protection
Implementation Roadmap
Implementation plan without downtime
Ransomware Stopped Production for 5 Days
Industrial manufacturer hit by ransomware. Attack came through office laptop from phishing. No IT/OT segmentation - malware spread to SCADA and PLCs. All 4 production lines stopped. Loss: €625,000 in revenue plus €125,000 ransom.
Without proper OT security architecture:
- IT attack spreads to production systems
- No isolation of critical control systems
- Unable to detect attack before it causes damage
- Production downtime during cybersecurity incident
Architecture Compliant with Purdue Model and IEC 62443
We design OT security architecture that protects production without impacting performance. Zone segmentation, Industrial DMZ, OT-dedicated monitoring.
What you get:
- Current OT network architecture analysis and risk identification
- Segmentation design according to Purdue Model (levels 0-4)
- Security zones definition and communication channels (conduits)
- Security Level definition for each zone according to IEC 62443
- Industrial DMZ design for secure IT/OT integration
- OT monitoring architecture (passive and active)
- Implementation plan with schedule and budget
- Architecture documentation and decision rationale
Who Is It For?
This service is for you if:
- You’re building a new factory or production line from scratch
- You’re modernizing OT infrastructure and want to build in security
- You must meet IEC 62443 architecture requirements
- You’re integrating IT with OT (MES, historian, analytics) and need to do it securely
- Audit revealed segmentation gaps and you need remediation design
Purdue Model and IEC 62443
Reference Model for OT Architecture
Purdue Model defines hierarchy levels in industrial environment:
| Level | Layer | Function | Examples |
|---|---|---|---|
| Level 4 | Enterprise | Business planning | ERP, CRM |
| Level 3.5 | DMZ | IT/OT integration | Historian, MES |
| Level 3 | Operations | Production management | MES, SCADA |
| Level 2 | Supervisory | Supervision and control | HMI, Engineering stations |
| Level 1 | Control | Process control | PLC, DCS, RTU |
| Level 0 | Process | Physical process | Sensors, actuators |
Security Zones
We segment OT network into zones by:
- Function - production, utility, safety systems
- Criticality - impact on safety and production
- Security requirements - different Security Levels
- Physical location - different facilities, buildings
Communication Channels (Conduits)
Controlled communication between zones:
- Firewall rules - only necessary traffic
- Unidirectional gateways - for critical systems
- Jump hosts - for remote access
- Data diodes - Level 0-1 separation from higher levels
Related Glossary Terms
Learn more about key concepts related to this service:
Contact your account manager
Discuss OT Security Architecture Analysis with your dedicated account manager.
How we work
Our proven service delivery process.
Environment Analysis
Mapping OT network, devices, communication
Zones & Conduits
Define security zones and communication channels
Security Level
Determine security level for each zone
Architecture Design
Detailed design with security technologies
Implementation Plan
Implementation roadmap with priorities
Benefits for your business
What you gain by choosing this service.
Production Protection
Cyberattack won't stop production lines
IEC 62443 Compliance
Meet customer requirements and regulations
No Downtime
Implementation doesn't affect factory operations
Threat Visibility
Detect attacks before they cause harm
Related Articles
Expand your knowledge with our resources.
CVE-2026-13762: Inconsistent interpretation of HTTP/2 requests in Amazon CloudFront with AWS WAF enabled might...
Inconsistent interpretation of HTTP/2 requests in Amazon CloudFront with AWS WAF enabled might allow remote actors to bypass AWS WAF managed rule body inspection via crafted HTTP/2 requests that fragm...
Read more →CVE-2026-13763: Inconsistent interpretation of HTTP/2 requests in AWS Application Load Balancer with AWS WAF...
Inconsistent interpretation of HTTP/2 requests in AWS Application Load Balancer with AWS WAF enabled might allow remote actors to bypass AWS WAF managed rule body inspection via crafted HTTP/2 request...
Read more →CVE-2026-37637: An issue in Alexantr filemanager v.1.0 allows a remote attacker to execute arbitrary code via the...
An issue in Alexantr filemanager v.1.0 allows a remote attacker to execute arbitrary code via the filemanager.php component...
Read more →Frequently Asked Questions
Common questions about OT Security Architecture Analysis.
Does the OT architecture analysis require stopping production?
No. We use passive methods (network traffic monitoring, documentation review, interviews with the OT team). Active scanning is performed exclusively outside production hours and after coordination with your team.
How long does the OT security architecture analysis take and what do I receive?
The analysis takes 1-2 weeks. You receive a segmentation design compliant with the Purdue Model (levels 0-4), security zone and communication channel definitions, an Industrial DMZ design, and an implementation plan with schedule and budget.
Does the analysis also cover legacy SCADA and PLC systems?
Yes. We specialize in environments with legacy systems (Windows XP, older SCADA versions), where traditional IT approaches don't work. We design protection that accounts for the limitations of older devices (no updates, proprietary protocols).
How does OT architecture relate to IEC 62443 and NIS2 requirements?
We design architecture compliant with IEC 62443-3-3 (zones & conduits, Security Levels) and NIST 800-82. This directly fulfills NIS2 requirements regarding segmentation and risk management in the industrial sector.