Simple security hygiene measures: regular software updates, password management and basic access controls.

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To start with, it is advisable to begin with simple hygiene measures. These include regular software updates, password management, and basic access controls, e.g. restricting the use of certain resources to individual MAC addresses.

The next step will show solutions that are more sophisticated. According to the defense-in-depth principle, several layers of security measures can be combined to create a multi-layered defense strategy. A mix of firewalls, intrusion detection systems, and encryption is recommended.

By separating the floor plan from the corporate network with a DMZ (demilitarized zone), a buffer network, direct communication between the corporate and floor network is prevented and access is controlled with firewalls.

Cybersecurity guidelines

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In addition, the isolation of critical segments is an important aspect for minimizing the movement and therefore the spread of threats within the network. To this end, the number of access points and the number of neighboring networks that can communicate with the most secure segments are kept to a minimum. This maintains the integrity of the entire network, even if one area is compromised.

Furthermore, authorization mechanisms should be adapted to the functional roles to ensure that people only have access to resources that are necessary for their tasks. It is advisable to separate administrative roles from other functions and thus strictly limit access to critical configurations and sensitive information.

Software upgrades

It makes sense to approach the topic of software upgrades with a meticulous inventory of the firmware versions of all important devices. This demands caution, professionals should check the authenticity of upgrades with the respective provider. Otherwise, the door is open for counterfeit malware.

The upgrade process should be carried out in stages so that the effects of upgrades can be monitored and evaluated on a smaller scale before they are applied to the entire network.

In many cases, an immediate firmware update is not possible. The recommended alternative is virtual patching. This involves implementing security measures at network or application level so that no changes to the firmware are required. Hence, network traffic can be actively monitored, malicious patterns identified, and vulnerabilities prevented from being exploited by outdated firmware.

Foster security awareness

In addition to technical measures, the human factor is crucial. Teams must be equipped with the necessary resources to master the intricacies of different types of attack. This starts with creating checklists and step by step procedures that act as practical guides for each type of attack. These materials should be simple and practical, and complex security measures should be broken down into practicable steps. This will enable cybersecurity specialists to empower other teams to respond effectively to threats.

In order to embed cybersecurity awareness in the minds of employees, regular training programs are needed that cover theoretical aspects as well as practical exercises on real-life scenarios.

The corporate culture is also an important pillar for security awareness, emphasizing an environment where team members can report security concerns without fear of reprisals, which is crucial. Placing blame for security incidents is counterproductive. Instead, the focus should be on understanding the causes and taking corrective action. Praise is also an effective way of encouraging positive behavior. Recognizing vigilance and responsiveness encourages employees to actively contribute to the safety of the company.

Security in the ecosystem

The maturity model - from simple protective measures to threat intelligence.

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A solid security strategy also takes all of the company's partners into account. This starts with defining clear rules. Authentication should be one of the non-negotiable security aspects, as it is proof of the legitimacy of interactions within the industrial ecosystem. Of course, authentication protocols must comply with industry standards and regulations. Apart from that, partner assessments, audits and security practices should be continuously scrutinized by experts.

Based on the principle "Together we are stronger", actively sharing threat intelligence and best practices is also recommended to ensure that security measures are mutually reinforcing.

Network monitoring

The first step of network monitoring is gaining a comprehensive understanding of the activities within the industrial ecosystem. With the help of modern tools and technologies, network traffic, device interactions and communication patterns can be observed in real time. This allows anomalies, potential vulnerabilities, and unauthorized access to be detected.

Monitoring security breaches requires robust intrusion detection systems, log analysis, and an active search for signs of unauthorized access, malware, or other security breaches. This is where the aforementioned culture of encouraging employees to report security incidents comes into play.

Every security incident should be meticulously documented, even (seemingly) minor incidents. It is helpful to develop a standardized process for recording the details of the incident, the measures taken, and the lessons learned. Such documentation not only ensures compliance with regulations, for example during audits, official inspections, or internal reviews, but also provides valuable insights for the continuous improvement of cybersecurity.

Continuous improvement

The author: Laurent Liou is Product Marketing Manager at Moxa.

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Cybersecurity is a never-ending task. With defined processes for continuous improvement, organizations create the preconditions for a continuous improvement cycle. This should include the regular review and refinement of security protocols, incident response procedures, and monitoring mechanisms. The evaluation should involve team members from different departments and hierarchical levels, and suggestions should be considered without reservation. Training programs, awareness campaigns, and collaboration frameworks should also be part of continuous improvement.

At the same time, the threat landscape is constantly changing. Active participation in threat intelligence networks and industry forums as well as continuous training help prepare people for evolving threats.