Trusted Time (NTP) Management
This guide establishes accurate and tamper-resistant time synchronisation across all OT assets, ensuring audit trail integrity and preventing time-drift that could invalidate certificates or bypass logging.
In a maritime cyber incident, time is the most important variable. Network Time Protocol (NTP) ensures that every device on the vessel—from the Bridge ECDIS to the Engine Room PLC—shares a single, accurate timestamp. Without this, correlating logs during a failure becomes technically impossible.
The Danger of “Time Drift”
Time drift occurs when internal hardware clocks diverge. In OT environments, even a 5-minute difference can have catastrophic security implications:
Log Incoherence
During a breach, unsynchronized logs show events happening out of order. You cannot determine if the Engine Alarm caused the Network Failure or vice versa, leading to Forensic Dead-Ends.
Certificate Expiry
Modern encryption (SSL/TLS) and 2FA codes are time-sensitive. If an AMS server drifts, it will reject legitimate encrypted traffic, causing System-Wide Communication Loss.
Replay Attacks
Hackers can intercept and “replay” old commands if the system’s clock is lagging, as the device may believe a stale command is actually current and valid.
Zone-Based Time Architecture
To maintain E26 compliance, we utilize a tiered distribution model. This ensures that even if the IT network is compromised, the OT Zone maintains its “Trusted Time.”
The specific regulatory requirements this playbook satisfies. Use these references when preparing for Class survey or responding to a surveyor's checklist.
