Figure 1: Simple security hygiene measures: regular software updates, password management and basic access controls.

© Moxa

To get started, it is advisable to begin with simple hygiene measures(Fig. 1). These include regular software updates, password management and basic access controls, such as restricting access to certain resources to individual MAC addresses.

More sophisticated solutions follow in the next step. According to the defense-in-depth principle, several layers of security measures can be combined to create a multi-layered defense strategy (see image on the left). A combination of firewalls, intrusion detection systems and encryption is suitable for this. 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.

Figure 2: Cybersecurity guidelines

© Moxa

In addition, the isolation of critical segments is a crucial aspect in minimizing the movement and thus the spread of threats within the network (Fig. 2).
minimized(Figure 2). To this end, the number of access points and the number of neighboring networks that can communicate with the most secure segments is kept to a minimum. This maintains the integrity of the entire network, even if one area is compromised. In addition, authorization mechanisms should be adapted to the functional roles to ensure that people only have access to resources that are really 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.

Promoting safety 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 to each type of attack. These materials should be simple and practical, and complex security measures should be broken down into actionable steps. This will enable cybersecurity specialists to empower other teams to respond effectively to threats.

In order to anchor 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.

Corporate culture is also an important pillar for security awareness: an environment in which team members can report security concerns without fear of reprisals is crucial. Assigning 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 to encourage 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.

© Moxa

A solid security strategy also takes all of the company's partners into account. This starts with formulating clear rules. Authentication should be one of the non-negotiable aspects of security, as it is proof of the legitimacy of interactions within the industrial ecosystem. Authentication protocols must, of course, comply with industry standards and regulations. In addition, partner assessments, audits and security practices should be continuously reviewed by experts.
Under the motto "Together we are stronger", an active exchange of threat intelligence and best practices is also recommended to ensure that security measures reinforce each other.

Network monitoring

The first step in network monitoring is to gain 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 monitored 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 actively searching 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.

© Moxa

Cybersecurity is a never-ending task. With defined processes for continuous improvement, companies create the conditions 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 to be prepared for evolving threats.