Safety
Security decisions must respect people, equipment and physical processes.
Availability
Controls should account for uptime, recovery and production requirements.
Integrity
Commands, configurations and operational data must remain trustworthy.
Controlled access
Every human, vendor, system and device connection needs an accountable path.
When technology controls a physical process, a cyber incident can become an operational event.
Cyber risk becomes operational risk
Factories, utilities, healthcare facilities, warehouses, buildings and connected products increasingly depend on systems that were not designed for today's level of connectivity. Equipment with long service lives now exchanges data with business applications, cloud platforms, maintenance providers and remote users.
This connectivity supports efficiency and visibility, but it can also create poorly understood access paths. The security objective is to identify those paths, understand their operational consequence and introduce controls that the environment can safely support.
NIST's current OT security guide emphasises that OT safeguards must account for performance, reliability and safety requirements. NIST SP 800-82 Rev. 3
Loss of visibility
Operators may be unable to determine the current state of a process or connected asset.
Loss of control
Unauthorised commands or unavailable systems can affect production and service delivery.
Loss of confidence
Teams may no longer trust configurations, sensor data, alarms or recovery processes.
THE OPERATIONAL TRUST BOUNDARY
Every connection needs a purpose, an owner and a controlled path
Enterprise and cloud
Understand which business and cloud systems interact with operational environments.
IT-to-OT boundary
Control and inspect communication between business and operational networks.
Operational supervision
Protect systems used to observe, configure and manage industrial processes.
Control and automation
Limit unauthorised interaction with systems that influence physical processes.
Field devices and IoT
Establish trust and lifecycle control for devices operating at the edge.
The final architecture must reflect the actual process and consequence of failure. Do not present this layered model as a mandatory design for every environment.
You cannot protect an operational environment you cannot account for
Asset discovery in OT requires care. Unplanned active scanning can affect fragile or legacy equipment. Digisecuritas selects evidence-gathering methods based on the environment, approved maintenance windows and the potential operational impact.
CISA's OT asset-inventory guidance recommends identifying and prioritising high-criticality assets so appropriate controls can be applied. CISA OT asset inventory guidance
| Asset or system | Operational function | Zone | Owner | Connectivity | Criticality | Support status | Security dependency |
|---|---|---|---|---|---|---|---|
| Critical process controller | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined |
| Supervisory workstation | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined |
| Remote sensor gateway | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined |
| Engineering laptop | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined | To be defined |
What should we know about every critical asset?
What process does it support?
Who owns and maintains it?
Which systems communicate with it?
Who can access it remotely?
What happens if it becomes unavailable?
How is its configuration recovered?
Is the vendor still supporting it?
IoT and OT security services built around operational reality
OT cybersecurity risk assessment
Assess the systems, connections, operational dependencies and governance practices that shape cyber risk. Findings are prioritised using operational consequence, realistic threat paths and the feasibility of remediation.
Typical outputs
OT asset discovery and visibility review
Develop or validate an inventory of operational assets, connected devices, communication paths and system owners. Select passive and controlled discovery methods that respect the stability of the environment.
Typical outputs
OT network architecture and segmentation review
Examine trust boundaries, industrial DMZ design, traffic flows, firewall policy and communication between IT and OT. Identify unnecessary paths and propose a practical target-state architecture.
Typical outputs
Secure remote-access assessment
Review how employees, suppliers, integrators and equipment vendors reach operational systems. Examine authentication, approval, session control, monitoring, time-bound access and emergency procedures.
Typical outputs
IoT device and product security assessment
Assess device identity, authentication, interfaces, communications, update mechanisms, cloud dependencies, data handling and lifecycle support for connected devices or IoT products.
Typical outputs
OT vulnerability and exposure validation
Identify and safely validate weaknesses across permitted OT systems, management components and boundary services. Testing must follow an approved rules-of-engagement document and operational safety constraints.
Typical outputs
OT monitoring and detection review
Evaluate whether security teams can identify activity that matters inside the operational environment. Review telemetry sources, detection logic, baselines, alert handling and coordination between SOC and plant teams.
Typical outputs
OT incident response readiness
Prepare teams to investigate and contain cyber incidents without causing further operational harm. Align technical response, site operations, engineering, safety, legal and executive decision-making.
Typical outputs
Remote access should be temporary, attributable and observable
Request
A named user or supplier requests access for a defined operational purpose.
Approval
The appropriate asset or process owner approves the request and access window.
Authentication
The user is strongly authenticated through an authorised access path.
Restriction
Access is limited to the required system, protocol, privilege and duration.
Observation
The session and relevant actions are logged or monitored.
Closure
Access expires, the session is reviewed where required and standing privileges are removed.
Emergency access should follow a documented break-glass process with clear accountability. It should not become an undocumented permanent bypass.
Reduce exposure by controlling how operational zones communicate
Enterprise zone
Corporate users, applications and internet-connected services.
Operations management zone
Systems used to supervise and support operational activity.
Control zone
Systems that issue or coordinate process commands.
Field zone
Sensors, actuators and devices interacting with physical processes.
A zone-and-conduit model groups systems with similar security needs and controls communication between those groups. The final design must be based on risk and process requirements, not copied from a generic reference architecture.
The ISA/IEC 62443 series provides security requirements and lifecycle processes for industrial automation and control systems. ISA/IEC 62443 series
HOW WE WORK
Assessment without unnecessary operational risk
Establish the system boundary
Define the sites, production lines, connected products, operational processes, third parties and supporting IT systems in scope.
Understand operational consequence
Work with engineering, safety, operations and business teams to understand what system failure or manipulation could mean.
Gather evidence safely
Review documentation, architecture, configuration and telemetry. Use passive or controlled technical validation based on the agreed rules of engagement.
Map exposure paths
Examine external connections, IT-to-OT communication, remote access, privileged accounts, portable media and supplier dependencies.
Validate priorities
Separate material operational risks from findings that have limited real-world consequence or cannot be addressed using standard IT practices.
Build the roadmap
Define immediate corrections, planned engineering improvements and longer-term architecture decisions with owners and dependencies.
No intrusive testing, active scanning or production change should occur without explicit written authorisation and an agreed operational safety plan.
Framework alignment
| Reference | How it may be used | Page language |
|---|---|---|
| NIST SP 800-82 | OT architecture, threats, vulnerabilities and safeguards | OT security guidance |
| ISA/IEC 62443 | IACS security lifecycle, programmes, systems and components | Industrial security requirements |
| NIST Cybersecurity Framework | Governance and risk-management structure | Cybersecurity programme alignment |
| CISA Cybersecurity Performance Goals | Prioritised safeguards for IT and OT | Foundational risk reduction |
| Sector requirements | Industry-specific obligations and expectations | Applied according to scope |
Frameworks provide structure, but the assessment must remain specific to the operational process, asset criticality, threat exposure and organisational responsibilities. Do not claim that an assessment automatically produces certification or regulatory compliance.
Replacement is not always immediate. Exposure can still be reduced.
Operational environments may depend on systems that cannot be patched, upgraded or replaced during a normal IT maintenance cycle. Where direct remediation is not practical, Digisecuritas helps teams identify compensating controls that reduce risk while a longer-term plan is developed.
Restrict communication
Limit the systems, services and paths that can reach the asset.
Control administration
Use managed access paths, named users and time-bound privilege.
Increase visibility
Monitor relevant communication and changes without destabilising the process.
Prepare recovery
Maintain tested configurations, backups, spares and restoration procedures appropriate to the equipment.
Compensating controls reduce exposure around the underlying vulnerability. They do not remove it.
What your organisation receives
Clear evidence for security, engineering and leadership decisions.
Final deliverables depend on the agreed assessment scope, evidence available and safety restrictions within the environment.
OT security depends on shared decisions
Operations and engineering
Cybersecurity
IT and infrastructure
Vendors and integrators
OT security requires coordinated decisions across operations, engineering, safety, IT and cybersecurity. It is not a project owned by the IT team alone.
When organisations bring Digisecuritas in
Before connecting a site or device fleet
Security requirements need to be defined before operational systems connect to cloud services, business networks or external support platforms.
After years of undocumented change
Network paths, devices, vendor accounts and operational dependencies have accumulated without a dependable current-state view.
Following an acquisition or integration
Leadership needs to understand the cyber exposure introduced by a newly acquired plant, connected product or operational environment.
When incident readiness is uncertain
Security and operations teams need a shared plan for investigating and containing an event without creating avoidable safety or availability consequences.
Independent security judgement shaped around the operation
Consequence-led prioritisation
Findings are assessed in relation to the process, safety, availability and business impact they could affect.
Careful technical validation
Testing methods and evidence gathering are selected around system sensitivity and agreed operational constraints.
IT and OT context
Recommendations consider the enterprise services, identities and suppliers that support the operational environment.
Practical improvement planning
The roadmap distinguishes immediate exposure reduction from engineering work that requires planned investment or downtime.
Related solutions
Detection & Response
Build monitoring and response workflows around security signals that matter.
Identity & Access Security
Control employee, contractor, vendor and machine access.
Cloud Security
Protect the cloud services connected to operational systems and IoT products.
Offensive Security
Validate selected exposure paths under agreed safety constraints.
Technology Consolidation & Architecture
Clarify security roles, integrations and control overlap across the environment.
IoT and OT security questions, answered clearly
START WITH THE SYSTEMS THAT MATTER MOST
Understand your operational exposure before it becomes disruption
Tell us which sites, connected devices or operational systems concern you. Digisecuritas will help define a safe assessment scope and a practical route to stronger control.
Independent assessment • Operationally aware testing • Clear remediation priorities