Industrial cyber risk increasingly impacts operational availability and safety. In OT and ICS environments, weaknesses in segmentation, remote access governance, identity controls, or unmanaged assets can create exposure pathways with real operational consequences.

Arista Cyber provides engineering-led OT/ICS cybersecurity services aligned to IEC 62443 and informed by the Purdue Model and NIST SP 800-82. We apply a risk-based security approach that prioritises controls based on consequence to safety, availability, and production integrity, not generic IT scoring.

Our work is designed for executive oversight and operational execution. We produce implementation-ready outputs that support governance, withstand audit scrutiny, and can be deployed safely in live industrial environments.

Our Comprehensive OT Cybersecurity Services

1. Assessment & Analysis

Establish a defensible understanding of OT assets, communications, and risk exposure that directly impact safety, reliability, and production continuity.

2. Secure Design & Deployment

Translate assessment findings into an OT-aligned architecture that supports operations, maintenance, and safety objectives.

3. Operate & Improve

Sustain security performance through continuous visibility, response readiness, and disciplined recovery.

4. Training & Transformation

Embed cybersecurity into daily operations through role-based capability and shared accountability.

Industries We Protect

We support OT and ICS environments where cyber risk translates into operational consequence, including loss of availability, safety exposure, and regulatory impact. Our work remains aligned to recognised standards and is tailored to each sector's operating constraints, asset criticality, and process risk.

OIL & GAS

Upstream, midstream, and downstream operations with safety systems, remote connectivity, and high availability requirements.
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MANUFACTURING

Production environments where segmentation, change governance, and resilience protect throughput and quality.
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ENERGY & UTILITIES

We work with utilities where segmentation, access governance, and OT visibility must be improved without introducing operational instability.
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PHARMACEUTICALS

We support regulated production sites where access, change control, and documentation need to be consistently enforced across OT systems.
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AUTOMOTIVE

Production lines are highly connected and time-sensitive. Segmentation and controlled engineering access help reduce disruption risk without slowing operations.
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MINING

Sites are remote and often bandwidth-constrained. Secure remote access and dependable visibility are critical when OT assets are spread across wide areas.
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How We Are Different: Engineering-Led Delivery

We operate as an engineering-led advisor with an implementation mindset. Our focus is to help organisations reduce OT cyber risk through defensible architecture decisions, practical controls, and operationally safe execution, not high-level recommendations.

Assessment-first, always

We start with structured diagnostics using IEC 62443 and risk-based methods to establish an accurate view of exposure. This includes asset criticality, trusted pathways, segmentation gaps, and the most likely routes to loss of control, loss of view, or loss of availability.

Designed for real plants

Our recommendations account for the constraints that define OT environments: legacy platforms, vendor limitations, strict change windows, and safety requirements. Solutions are designed to be enforceable in the field, not just documented in reports.

People and governance are built in.

We align OT, IT, engineering, and leadership around clear decision rights, operating procedures, and role-based responsibilities. This reduces execution friction and supports sustained resilience beyond a single project.

Built to scale, designed to fit

We support single-site improvements and multi-site programmes with consistent standards alignment. Architecture patterns, segmentation models, and governance artefacts remain consistent across portfolios while still respecting local operational realities.

Our Work in Action: Case Studies

SECURING A NATIONAL POWER GRID

Challenge:
A national power grid operator needed to achieve and maintain NERC CIP compliance across multiple facilities.

Solution:
Arista Cyber conducted a full gap assessment, implemented a defense-in-depth architecture, and delivered role-based training for their OT personnel

Result:
The operator achieved full compliance ahead of schedule, reduced critical vulnerabilities by 90%, and embedded a sustainable security culture.

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Securing the world’s critical Infrastructure

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FAQs: OT Cybersecurity Services

Clear visibility of critical assets and data flows, a risk-ranked plan tied to operational consequence, enforceable segmentation and access controls, monitored detection in critical conduits, and incident readiness that protects safety and availability.

We align to IEC 62443 for industrial security program structure and zone/conduit concepts, NIST SP 800-82 for ICS guidance, and the Purdue Model for segmentation logic. Where applicable, we support expectations aligned to NIST CSF and NERC CIP.

Prioritisation is consequence-driven. We rank work based on asset criticality, exposure pathways, and likely operational impact, while accounting for safe change windows and vendor support constraints.

Segmentation is built around Purdue levels and IEC 62443 zone and conduit concepts. We define trust zones based on function and consequence, then specify conduits with controlled pathways, enforcement points, and monitoring requirements.

It means removing implicit trust. Access is identity-driven, privilege is controlled, pathways are enforceable, and sessions are governed. The aim is to support remote operations while limiting exposure to critical zones.

Yes, when designed correctly. OT monitoring is typically implemented using passive methods and carefully selected monitoring points, so visibility improves without creating instability in control systems.

It can be, but only when OT-specific scoping, governance, and controls are used. We avoid methods that risk destabilising legacy devices and coordinate testing to protect safety and availability.

Start with operational truth: validated inventory, architecture, and data flow visibility, and a risk-ranked exposure map. Without that baseline, investments in controls tend to be poorly targeted and difficult to defend.

We develop OT-specific playbooks and decision paths that account for operational safety and recovery. Response is aligned across OT, IT, and leadership, so actions are controlled and consequence-aware.

Through measurable artefacts and governance evidence: zone and conduit models, segmentation rationale, control requirements, risk-ranked backlog closure, monitoring coverage in critical conduits, and documented procedures for response and recovery.

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OT CYBERSECURITY SERVICES