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    <subfield code="f">Dimitra Liveri, Marianthi Theocharidou, Rossen Naydenov</subfield>
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    <subfield code="a">Introduction. 1.1 Policy and regulatory context. 1.2 Study scope. 1.3 Study objectives.  1.4 Target audience. 1.5 Methodological approach. 1.6 Structure of the report. 2. The railway sector. 2.1 Railway stakeholders. 2.1.1 NIS directive implementation &#x2013; authorities. 2.2 Essential railway services. 2.2.1 NIS directive implementation &#x2013; essential services. 2.3 Railway systems. 3. Cybersecurity measures. 3.1 Cybersecurity challenges. 3.2 Minimum security measures. 3.2.1 Governance and ecosystem. 3.2.2 Protection. 3.2.3 Defence 3.2.4 Resilience. 4. Cybersecurity in ERTMS. 4.1 ERTMS definition and architecture. 4.2 Cybersecurity on ERTMS. 5. Conclusions. 5.1 Security measures.  5.2 Considerations. 5.3 Next steps.</subfield>
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