How can businesses secure programmable logic controllers (PLCs) against cyber threats?

Businesses can secure programmable logic controllers (PLCs) against cyber threats that target critical operations by implementing the following measures:

1. Network Segregation: Keep PLC networks isolated from external networks to limit access to authorized personnel only.

2. Access Control: Implement strict access controls such as strong passwords, multi-factor authentication, and role-based access to ensure only authorized individuals can interact with PLCs.

3. Regular Updates: Keep PLC firmware and software up to date with the latest security patches to protect against known vulnerabilities.

4. Monitoring and Logging: Monitor PLC network traffic for any suspicious activity, and maintain detailed logs for analysis in case of a security incident.

5. Security Training: Provide training to employees on cybersecurity best practices and how to recognize and respond to potential threats targeting PLC systems.

6. Firewalls and Intrusion Detection Systems: Implement firewalls and intrusion detection systems to detect and prevent unauthorized access to PLC networks.

7. Encryption: Use encryption protocols to secure communication between PLC devices and other systems to protect against interception and tampering.

8. Vendor Risk Management: Evaluate the security practices of PLC vendors and consider security features when sourcing new PLC equipment.

By implementing a combination of these measures, businesses can enhance the security of their PLC systems and protect critical operations against cyber threats.