
At sea, there's no "call the IT help desk" option.
When a cyber incident hits 300 nautical miles offshore, your vessel's systems
either have the resilience built in — or they don't.
UR E27 FR6 and FR7 cover 7 requirements designed around that reality.
📋 TIMELY RESPONSE TO EVENTS (FR6 — Item 23)
- Audit Log Accessibility (SR 6.1): Authorized personnel and tools must have
read-only access to audit logs at all times.
No incident response without evidence. No evidence without accessible logs.
🔧 RESOURCE AVAILABILITY (FR7 — Items 24–29)
- DoS Protection (SR 7.1): Essential vessel functions must remain operational
even during a denial-of-service attack. Navigation doesn't pause for hackers.
- Resource Management (SR 7.2): Security functions must limit resource consumption
to prevent exhaustion — a common attack vector in OT environments.
- System Backup (SR 7.3): Backup capability must not impact normal operations.
Location of essential files must be documented and retrievable.
- System Recovery & Reconstitution (SR 7.4): After a breach or failure,
the system must be restorable to a KNOWN SECURE STATE.
Not just "operational" — secure.
- Emergency Power Transition (SR 7.5): Switching to/from backup power must not
compromise or alter the current security posture.
- Least Functionality (SR 7.7): Disable and restrict all unnecessary ports,
protocols, functions, and services by default.
IEC 62443-3-3 perspective: FR7 availability requirements exist because in IACS,
system availability IS the security goal — unlike IT where confidentiality leads.
For a vessel, an unavailable ECDIS is as dangerous as a compromised one.
Next (and final) post in this series:
What happens when your vessel connects to shore?
12 additional requirements for untrusted network interfaces.
#MaritimeCyberSecurity #IACS #URE27 #IEC62443 #CyberResilience
#OTSecurity #IncidentResponse #ShipSafety
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