Remote connectivity allows engineers, vendors, and plant managers to monitor systems and perform predictive maintenance on PLCs and SCADA software without being on-site.

• The Challenge: Conventional IT Virtual Private Networks (VPNs) can expose entire industrial networks to external cyber threats if improperly configured.
• Best Practice: Implement Zero Trust Network Access (ZTNA) solutions, multi-factor authentication (MFA), and secure jump hosts so remote workers can access only the specific devices they need to service.
• Audit and Log: Continuously log and audit all remote user sessions to meet strict regulatory compliance requirements.

Access control dictates exactly who - or what - can interact with industrial control systems and enter restricted areas.

• Swipe Card Integration: Swipe card machines (proximity card readers) serve as the primary physical gateway, authenticating employees before granting physical access to server rooms, factory floors, or control terminals.
• Least Privilege: Apply granular role-based access control (RBAC) to ensure operators and third-party vendors are granted the minimum level of physical and digital access necessary to perform their jobs.
• Physical Controls: Utilise physical port blockers on unused Ethernet, USB, and serial ports to prevent unauthorised devices or rogue USB drives from connecting to critical machinery.
• Identity Verification: Integrate identity and access management (IAM) frameworks to quickly disable credentials and swipe cards for contractors who have completed their projects.

Closed-circuit television (CCTV) cameras form a crucial part of an organisation's physical and OT security perimeter, helping to monitor both site safety and unauthorised entry.

• Network Segmentation: IP-based surveillance cameras and smart entry systems must be separated from core operational control networks. If a compromised camera connects to an unsecured network, it could serve as a gateway to critical operational systems.
• Environmental Surveillance: CCTV feeds paired with motion sensors, swipe card access logs, and intrusion alarms provide an immediate visual audit trail when triggered.
• Surveillance Integration: Utilise ONVIF-compliant CCTV cameras that can easily integrate with centralised building management and access control systems for a complete, bird's-eye view of your facility's physical security.

Electronic Funds Transfer at Point of Sale (EFTPOS) terminals are specialised OT assets that handle critical financial transactions in retail, petroleum, and automated vending environments.

• Strict Network Isolation: EFTPOS systems must be rigorously segmented into dedicated Payment Card Industry (PCI) networks, entirely separate from both the general corporate IT network and underlying plant operations.
• Data Encryption: Ensure all terminal data is protected by End-to-End Encryption (E2EE) or Point-to-Point Encryption (P2PE) from the moment a card is inserted or tapped, preventing malicious interception of sensitive financial data.
• Tamper Prevention: Regularly inspect physical EFTPOS machines for skimming devices, and implement firmware integrity checks to ensure the payment software has not been altered or compromised.