Security 5 min read

NIS2に基づく重要インフラ保護：完全ガイド

NIS2が重要インフラのサイバーセキュリティ要件をどう変えるか。セクター別義務とコンプライアンス戦略。

NIS2 Raises the Bar for Critical Infrastructure Security

Critical infrastructure operators have always been high-value targets for nation-state actors and cybercriminals. With NIS2 now in full enforcement across the EU, the regulatory framework for protecting essential services has undergone its most significant overhaul in a decade. This guide covers what critical infrastructure operators need to know and do to meet the new requirements.

What NIS2 Defines as Critical Infrastructure

NIS2 categorizes covered entities into two tiers with distinct obligations:

Essential Entities (Stricter Requirements)

Energy: Electricity, oil, gas, hydrogen, district heating
Transport: Air, rail, water, road transport operators
Banking & Financial Market Infrastructure
Health: Hospitals, reference laboratories, medical device manufacturers
Drinking water supply & wastewater
Digital infrastructure: IXPs, DNS providers, TLD registries, cloud computing, data centers, CDNs
ICT service management (B2B)
Public administration
Space

Important Entities (Baseline Requirements)

Postal and courier services
Waste management
Manufacturing of critical products (chemicals, medical devices, electronics)
Food production and distribution
Digital providers (marketplaces, search engines, social networks)

Technical Security Measures Required

Article 21 of NIS2 specifies minimum security measures. For critical infrastructure, these translate to:

1. Risk Analysis and Security Policies

Comprehensive risk assessments covering IT, OT, and IoT systems
Board-level approved information security policies
Regular review cycles (at minimum annually, or after significant changes)
Asset inventory covering all connected systems including operational technology

2. Incident Handling

24-hour early warning to national CSIRT after detecting a significant incident
72-hour incident notification with initial assessment of severity and impact
1-month final report with detailed description, root cause, and mitigation measures
24/7 incident response capability for essential entities

3. Business Continuity and Crisis Management

Backup and disaster recovery procedures tested at least quarterly
Crisis management plans specific to cyber incidents
Redundancy for critical systems and services
Coordination with national crisis management frameworks

4. Supply Chain Security

Security assessment of direct suppliers and service providers
Contractual security requirements for third parties
Monitoring of supply chain vulnerabilities
Software Bill of Materials (SBOM) for critical software components

⚠️ OT/ICS Special Considerations

Critical infrastructure operators with operational technology must address IT/OT convergence risks. NIS2 requires security measures for the entire attack surface, including SCADA systems, PLCs, and industrial IoT devices that may have been historically excluded from IT security programs.

Sector-Specific Implementation

Energy Sector

Energy operators face unique challenges including:

Legacy SCADA systems with 20+ year lifespans and limited patching capability
Real-time availability requirements preventing maintenance windows
Grid interconnection creating cross-border attack surfaces
Smart meter infrastructure exposing millions of new endpoints

Healthcare

Medical device security with patient safety implications
Interoperability requirements conflicting with network segmentation
Research data protection alongside clinical systems
Ransomware resilience with life-or-death stakes

Transport

Safety-critical systems requiring certified security solutions
Connected vehicle infrastructure (V2X) security
Air traffic management system protection
Maritime cyber risk management (IMO requirements overlapping NIS2)

Compliance Strategy for Critical Infrastructure

Scope determination: Map all systems, services, and dependencies that fall under NIS2
Gap assessment: Compare current security posture against Article 21 requirements
OT security audit: Specifically assess operational technology environments
Vulnerability management program: Implement continuous scanning across IT and OT
Incident response buildout: Establish 24/7 capability with defined notification procedures
Supply chain assessment: Evaluate and contractually bind critical suppliers
Testing and validation: Regular penetration testing and crisis exercises
Documentation: Maintain audit-ready evidence of all measures

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