Operational Technology (OT) & ICS Security

OT Audit and Assurance

Industrial environments create specific audit challenges. Controls that look adequate on paper may not reflect how systems are actually segmented, accessed, and operated. Useful OT audit accounts for this.

Logiq delivers NCSC-assured OT audit and assurance services aligned to NIS, COMAH, CAF, ISA/IEC 62443, and NIST SP 800-82. We assess governance, architecture, policies, technical controls, and operational practices across OT systems, building a defensible picture of current security posture and resilience.

Our reviews are shaped around how industrial environments actually operate. That includes examining zones and conduits, segmentation, remote access, incident response arrangements, and the relationship between cyber risk, operational continuity, and process safety. Findings are prioritised on a risk basis, giving organisations clear evidence of where attention and investment should be focused.

Organisations come away with stronger regulatory readiness, clearer board-level visibility of OT cyber risk, and prioritised findings they can act on.

Our Approach

• Independent OT audit aligned to NIS, COMAH, CAF, ISA/IEC 62443, and NIST SP 800-82
• Assessment of governance, technical controls, and operational practices across OT estates
• Review of zones, conduits, segmentation, and secure architecture principles
• Validation of cyber policies, standards, and compliance arrangements
• Risk-based prioritisation of findings and recommendations
• Evidence suitable for regulators, auditors, and senior decision-makers

OT Risk Management

In industrial environments, the consequence of a cyber event is not measured in data alone. Production loss, safety incidents, and regulatory exposure are all in scope. Risk management has to reflect this.

Logiq delivers OT risk management services aligned to NIS, COMAH, CAF, ISA/IEC 62443, and NIST SP 800-82. We assess vulnerabilities across OT and connected IT environments, apply protocol-aware threat modelling, and evaluate consequences for critical processes, safety, continuity, and resilience.

Our work combines structured risk assessment with practical understanding of industrial systems such as SCADA, DCS, PLC, RTU, and IIoT. We identify credible worst-case scenarios, review remote access and architecture weaknesses, and develop risk treatment plans that are proportionate to the environment and consistent with organisational risk appetite.

Organisations get a clearer view of where OT exposure actually sits, a risk model that supports defensible decisions, and stronger readiness for regulatory and audit expectations.

Our Approach

• Tailored OT risk assessments across industrial and connected environments
• Review of IT and OT vulnerabilities, including remote access
• Protocol-aware OT threat modelling and attack surface analysis
• Consequence-driven assessment for critical processes and safety impacts
• Use of CAF and ISA/IEC 62443 principles to structure risk management
• Prioritised treatment planning and support for defensible risk acceptance

OT Security Safety Process

In process industries, a cyber event does not stay in the cyber domain. It can initiate or escalate a physical hazard, affect protective systems, and compromise the safeguards that sit between normal operation and a high-consequence outcome.

Logiq supports integrated security and safety assessment by linking OT cyber risk management with methods such as HAZOP and LOPA, alongside IEC 61508, IEC 61511, ISA/IEC 62443, COMAH, NIS, and CAF. This helps organisations understand how cyber threats can affect safety functions, process hazards, and high-consequence scenarios.

Our approach focuses on the practical relationship between safeguards, segmentation, alarms, protective logic, and operational decision-making. We examine how cyber events could initiate or worsen process hazards, and we identify risk reduction measures that are defensible to operators, regulators, and insurers.

Organisations gain a more coherent view of where cyber and process safety risks meet, stronger evidence for compliance, and decision-making that accounts for both.

Our Approach

• Integration of HAZOP and LOPA thinking into cyber risk assessment
• Assessment of cyber-initiated hazards affecting safety functions and processes
• Support for secure segmentation across SIS, BPCS, and wider OT environments
• Actionable recommendations that reduce security and safety risk together
• Audit-ready documentation for regulators, insurers, and governance bodies

OT Incident Response Exercise Service

An incident response plan that has never been exercised is a document, not a capability. Testing it under realistic OT conditions is what turns intent into something that can actually be relied on.

Logiq delivers OT cyber incident response exercises that simulate credible scenarios across environments such as SCADA, DCS, PLC, and safety-critical systems. These exercises test detection, containment, escalation, coordination, and recovery processes, while examining how cyber incidents could affect wider operations and safety outcomes.

Our approach is structured around lessons identified as much as testing itself. We highlight procedural, technical, and governance gaps, assess the quality of coordination and decision-making under pressure, and provide an improvement roadmap that can be absorbed into policies, plans, and resilience arrangements.

Leadership and operational teams come away more confident, with identified gaps addressed and a response capability that is aligned to business continuity, safety, and regulatory expectations.

Our Approach

• Realistic OT cyber incident simulations
• Testing of OT-specific response plans, coordination, and recovery processes
• Identification of technical, procedural, and governance gaps
• Lessons identified and improvement roadmap development
• Alignment with NIS, CAF, and ISA/IEC 62443 expectations
• Support for resilience, business continuity, and compliance objectives

OT Security Architecture

Applying standard IT security architecture patterns to OT environments rarely works. The constraints are different — uptime, legacy systems, safety interdependencies, and operational continuity all shape what a workable architecture can look like.

Logiq designs OT security architectures using ISA/IEC 62443 zones and conduits, aligned to NIS, COMAH, CAF, and wider organisational security frameworks. We create architectures that support secure segmentation, remote access control, monitoring, and resilience across SCADA, DCS, PLC, RTU, IIoT, and hybrid IT/OT environments.

Our work combines industrial understanding with broader enterprise and cloud experience. That means designing architectures that can support convergence where appropriate, integrate with monitoring and detection capabilities, and provide a clear blueprint for implementation, governance, and ongoing assurance.

Organisations end up with a more coherent OT architecture, with clear models and roadmaps that support resilience, regulatory confidence, and better risk decisions over time.

Our Approach

• Design of OT security architectures using ISA/IEC 62443 zones and conduits
• Support for segmentation, remote access, monitoring, and detection design
• Alignment with NIS, COMAH, CAF, ISO/IEC 27001, and NIST principles where appropriate
• Integration with hybrid IT/OT and secure cloud environments where required
• Architectural blueprints and roadmaps for implementation and assurance
• Support for governance, resilience, and audit readiness

OT Business Process Mapping

In OT environments, resilience depends on more than individual systems. The real risk sits in how processes, dependencies, and operational outcomes are connected, and how failure in one area can cascade across the wider operation.

Logiq maps business-critical OT processes, dependencies, and interfaces to help organisations understand where cyber, operational, and safety risks intersect. This work links plant-level operations and industrial processes back to organisational risk management, resilience planning, and assurance activity, providing a clearer view of operational exposure.

Our approach focuses on how systems, people, and information flows support critical outcomes. We examine how those relationships behave under stress, where dependencies create hidden risk, and how failure could propagate across environments. This supports more informed decisions around control design, resilience, and investment.

Organisations gain a more complete understanding of their OT dependencies, a clearer view of where risk and consequence sit, and a stronger foundation for resilience planning and regulatory assurance.

Our Approach

• Mapping critical OT processes, dependencies, and information flows
• Linking operational processes to organisational risk and assurance frameworks
• Support for continuity planning, resilience objectives, and governance cycles
• Identification of process gaps and systemic weaknesses
• Improved evidence for regulators, auditors, and senior stakeholders