THE HUMAN FIREWALL: SECURING THE CREW, SAFEGUARDING THE SHIP Published: 16 December 2025 In the complex operational environment of a vessel, the integrity of your digital systems is as crucial as the seaworthiness of the hull. While sophisticated technology acts as a shield, the single most critical vulnerability is often found not in the hardware or software, but with the people operating it. An estimated 74% of all cyber breaches start because of the human element. [1] This staggering figure underscores a simple truth, that the most vulnerable point in cyber security is often the person at the keyboard. GTMaritime , providers of secure communication software for remote workers, ran controlled phishing simulations across a variety of vessels. The results were stark: Industry benchmarks suggest that phishing test failure rates typically fall between 2–5% [2] . GTMaritime results revealed 15% of maritime users clicked malicious links, with 7% submitting personal data. Cyber security therefore cannot solely be the responsibility of the shore-based IT department, it must be understood and adopted as a shared responsibility by everyone onboard. By fostering a vigilant, security aware mindset, every crew member can actively contribute to the vessel’s digital safety. To be an effective human firewall, you must first understand how criminals exploit psychology, trust, curiosity and urgency, to bypass technical controls Phishing: The Deceptive Lure The most common tactic remains phishing, a fraudulent attempt to acquire sensitive information such as login credentials, passwords or financial details. Attackers impersonate a trustworthy entity, casting a wide net commonly via email or text message hoping to trick the recipient into clicking a malicious link or downloading an infected file. Your defence against phishing requires caution. Always verify the sender’s email address and check for subtle misspellings in the domain. Treat unexpected or demanding messages with su