ISO27001 and NIS2: Synergies and importance in industrial OT environments

Points of convergence

ISO27001 certification and NIS2 compliance overlap in many respects in OT environments:

1. Risk-based approach: Both adopt an approach based on risk assessment and management, requiring the systematic identification of threats and vulnerabilities.
2. Security governance: Both ISO27001 and NIS2 require a clear governance structure with well-defined roles and responsibilities for security management.
3. Security controls: Many of the technical and organisational controls required by NIS2 are already provided for in Annex A of ISO27001, such as asset management, access control and physical security.
4. Incident management: Both provide for structured processes for the detection, response and reporting of security incidents.
5. Business continuity: Both ISO27001 (with control A.17) and NIS2 require business continuity and disaster recovery plans.

How ISO27001 supports NIS2 compliance

Adopting ISO27001 can significantly facilitate NIS2 compliance in OT environments:

1. An already structured framework: An organisation with ISO27001 already has an information security management system that can be extended to cover the specific requirements of NIS2.
2. Security culture: Implementing ISO27001 fosters a security culture that makes it easier to adopt the practices required by NIS2.
3. Documentation and processes: The documentation and processes required by ISO27001 can be adapted to meet the reporting and documentation requirements of NIS2.
4. Integrated approach: ISO27001 promotes an integrated approach to security that considers all the aspects relevant to OT environments.
5. Continuous improvement: The ISO27001 PDCA cycle ensures a continuous improvement process that helps maintain compliance over time, even as NIS2 evolves.# ISO27001 and NIS2: Synergies and importance in industrial OT environments

Introduction

In today’s industrial security landscape, the convergence of IT (Information Technology) and OT (Operational Technology) has created new challenges and vulnerabilities for industrial plants. Protecting OT environments – which include SCADA systems, PLCs, DCS and other industrial control systems – has become essential to guarantee not only operational continuity, but also the physical safety of plants and people.

In this context, ISO27001 certification and the NIS2 directive are two essential pillars of the security strategy for industrial environments. This article explores their importance, their overlaps and how they can be implemented synergistically in OT environments.

ISO27001 certification in OT environments

What ISO27001 is and why it matters for OT

ISO27001 is an international standard that defines the requirements for an information security management system (ISMS). Traditionally associated with IT environments, its relevance to OT environments has grown exponentially as the interconnection between the two domains has increased.

In industrial plants, ISO27001:

• Provides a structured framework to identify, assess and manage security risks
• Defines specific controls to protect critical information and systems
• Promotes a holistic approach to security that includes people, processes and technologies
• Establishes a continuous improvement cycle (PDCA: Plan-Do-Check-Act) to keep pace with evolving threats

Specific aspects of applying ISO27001 in OT environments

Implementing ISO27001 in OT environments has some specific characteristics:

1. Priority to operational objectives: While in IT environments the confidentiality of information is often the priority, in OT environments the availability and integrity of systems are crucial to ensure operational continuity.
2. Extended life cycles: OT systems typically have longer life cycles than IT systems, which makes implementing security updates more complex.
3. Real-time requirements: Many OT systems operate in real time and cannot tolerate interruptions, which limits the windows available for maintenance and security updates.
4. Proprietary protocols: OT environments often use proprietary or specialised communication protocols (such as Modbus, Profinet, OPC UA) that require specific security controls.
5. Critical physical environments: Security in OT environments includes the protection of critical physical assets, with potential implications for the safety of people and the environment.

The NIS2 directive and industrial plants

What NIS2 requires of the industrial sector

The NIS2 (Network and Information Security 2) directive is the evolution of the previous European Union NIS directive, aimed at improving the resilience and incident response capability of critical entities with regard to cyber security incidents. For the industrial sector, NIS2:

• Broadens the scope of application by including more industrial sectors considered essential or important
• Introduces stricter obligations on cyber risk management
• Requires appropriate technical and organisational measures to manage risks and prevent incidents
• Sets incident reporting requirements with defined timeframes
• Provides for significant penalties in the event of non-compliance

Specific impact on OT environments

In OT environments, NIS2 has a particularly significant impact:

• Requires greater protection for critical industrial control systems
• Imposes a risk assessment that takes into account the specific characteristics of OT environments
• Promotes the adoption of security standards such as IEC 62443 (specific to the security of industrial automation and control systems)
• Requires prompt reporting of incidents that could have a significant impact on industrial operations
• Requires business continuity and disaster recovery plans specific to OT environments

Conclusions

ISO27001 certification is a strategic asset for industrial plants that must comply with the NIS2 directive. The significant overlaps between the two frameworks allow organisations to implement an integrated approach to the security of OT environments.

In a context where cyber attacks on industrial plants are constantly increasing, adopting ISO27001 not only facilitates regulatory compliance with NIS2, but also contributes significantly to improving the organisation’s overall security posture.

Organisations that manage to integrate the requirements of both frameworks effectively, adapting them to the specific characteristics of OT environments, can gain a significant competitive advantage in terms of operational resilience and incident response capability.

The main challenge remains balancing security needs with the operational requirements of industrial plants, an objective that calls for specialised skills, effective governance and a systematic approach to risk management.