13 Mar How to protect critical infrastructure with optical fibre

In the complex machinery of a country, there are sectors whose operability is non-negotiable. We are talking about critical infrastructure: the set of facilities and networks that sustain energy, transport, the financial system, and healthcare. A failure in these systems does not only represent an economic loss; it can paralyse essential services for the entire population.

Traditionally, cybersecurity has focused on software, but recent incidents, such as attempted cable thefts in Malaga or Leon, have reopened the debate on the fragility of the physical layer. Optical fibre is not just a transmission medium; it is the first line of defence for these strategic assets.

Dedicated networks: shielding data from the public internet

One of the greatest risks for critical infrastructure is exposure. When control data from a power plant or a hospital travels over the public internet, it remains vulnerable to external cyberattacks, interceptions, or denial-of-service (DDoS) attacks.

lyntia’s solution involves offering dedicated networks and private circuits. By using optical fibre that does not “touch” the open internet, a sealed environment is created. This physical separation drastically reduces the attack surface, ensuring that strategic communications flow through an exclusive, encrypted channel beyond the reach of malicious actors.

Strategic cloud and high availability

Digitalisation has led many public entities to migrate their services towards cloud infrastructure management models. However, the cloud is only useful if it is accessible. For strategic infrastructure to operate in a cloud environment, it needs a connection that combines ultra-low latency with absolute availability.

If the physical cable fails, cloud infrastructure management disappears, leaving the entity blind. Therefore, high-capacity optical fibre connectivity is the sine qua non requirement for the digital sovereignty of critical services.

Physical resilience: the power of redundant fibre rings

The true protection of critical infrastructure lies not only in surveillance but in network architecture. As demonstrated by the digital blackout in Malaga following physical sabotage, the lack of alternative routes can amplify a local incident into a regional problem.

At lyntia, we base our security on redundancy through fibre rings:

• Break detection: If a cable is accidentally cut due to construction work or theft attempts, the system detects it in milliseconds.
• Automatic redirection: Traffic is instantly diverted through an alternative route in the ring.
• Service continuity: The end-user and control systems do not perceive the interruption, maintaining full operability while the affected section is repaired.

Acoustic detection: fibre as an intelligent sensor

Beyond transmitting data, current optical fibre technology allows the cable to be used as a seismic and acoustic sensor (DAS). By monitoring vibrations in the cable’s surroundings, it is possible to detect intrusion attempts, unauthorised excavations, or movements near sensitive perimeters even before physical damage occurs. It is, quite literally, turning thousands of kilometres of network into a real-time surveillance system.

Conclusion: integral shielding

Protecting critical infrastructure requires a 360-degree vision that unites logical cyber-defence with physical resilience. lyntia’s optical fibre provides that robust support, allowing cloud infrastructure management and the country’s essential operations to remain always active, secure, and protected against any threat.