ICS/OT Cybersecurity Design (Greenfield)
Our ICS/OT Cybersecurity Design service covers the full lifecycle of greenfield industrial projects. We work with engineering, procurement, and operations teams from the earliest design stages to deliver a secure-by-design architecture based on the Purdue model and IEC 62443, integrated through Pre-FAT, FAT, SAT, and into operational handover.
Security Built In, Not Bolted On
Greenfield projects offer a unique opportunity to embed cybersecurity into the foundation of a new ICS/OT system. Retrofitting security after commissioning is always more expensive, more disruptive, and less effective than designing it in from the start.
Our Cybersecurity Design service works alongside engineering and procurement teams from the earliest project stages. We define the security architecture based on the Purdue model and IEC 62443, select appropriate technology, and stay engaged through Pre-FAT, FAT, SAT, and post-deployment validation to ensure the design is implemented as intended.
Full Lifecycle Coverage
- Requirements analysis and constraint mapping
- Purdue model architecture design
- Zone and conduit segmentation strategy
- IDS, IPS, firewall, and SRA selection guidance
- Secure architecture validation
- Cybersecurity tool procurement support
- Pre-FAT security integration
- Remote and onsite FAT/SAT support
- Post-deployment validation and handover
Greenfield Security
Secure by design from concept through commissioning and into operations
Engagement Methodology
A structured, phased approach designed for the safety, availability, and compliance requirements of operational technology environments.
Requirements and Constraints Analysis
Understand client operations, process architecture, safety requirements, uptime constraints, and regulatory obligations. Define security objectives, target security levels per IEC 62443, and identify integration points with existing enterprise systems.
Architecture Design (Purdue Model)
Design the OT network architecture based on the Purdue Enterprise Reference Architecture. Define levels from Level 0 (process) through Level 5 (enterprise), with clear zone boundaries, DMZ placement, and data flow paths between levels.
Network Segmentation Strategy
Define zone and conduit architecture per IEC 62443. Specify security zones based on risk classification, design conduit rules for each permitted communication flow, and determine firewall and switch placement to enforce segmentation.
Security Technology Selection
Provide vendor-neutral selection guidance for IDS, IPS, industrial firewalls, managed switches, secure remote access (SRA) platforms, and endpoint protection. Evaluate products against operational requirements including protocol support, latency constraints, and environmental ratings.
Secure Architecture Validation
Review the complete security architecture through a structured validation process. Verify zone boundaries, conduit rules, access control design, and monitoring coverage against the defined security levels and threat model.
Procurement Support
Support the procurement process with technical specifications, vendor evaluation criteria, and compliance requirements for all cybersecurity components. Ensure purchased equipment meets the design requirements and operational constraints.
Pre-FAT Security Integration
Integrate cybersecurity requirements into Pre-FAT test plans. Define security acceptance criteria, configuration baselines, and validation checkpoints to be verified before the system leaves the vendor facility.
FAT and SAT Support
Provide remote and onsite engineering support during Factory Acceptance Testing and Site Acceptance Testing. Validate firewall rules, network segmentation, access controls, and monitoring configurations against the approved design.
Post-Deployment Validation
Conduct post-deployment security validation including traffic baselining, rule verification, and anomaly detection tuning. Provide support during the initial operational period and hand over documentation, baselines, and procedures to the operations team.
Service Deliverables
- OT security architecture design document (Purdue Model aligned)
- Zone and conduit architecture with security level assignments
- Network segmentation design with firewall and switch placement
- Security technology specifications and selection guidance
- Pre-FAT, FAT, and SAT security test plans and results
- Post-deployment validation report with traffic baselines
- Operational handover documentation and procedures
Frameworks We Align With
Industries Served
Start Your ICS/OT Cybersecurity Design (Greenfield) Engagement
Get in touch to discuss your specific OT environment and how we can scope this engagement for your organization.