system and communications protection

System and communications protection commonly refers to the set of technical and administrative safeguards used to protect information systems and the data they exchange from unauthorized access, disclosure, modification, or disruption. In regulated manufacturing environments, it is often discussed in the context of cybersecurity control frameworks such as NIST SP 800-53.

What it includes

System and communications protection typically covers:

• Boundary protection: Controlling traffic between networks and zones (for example, firewalls, demilitarized zones between OT and IT, and segmentation between production cells).
• Protection of data in transit: Using secure protocols (such as TLS for web traffic, VPN tunnels for remote access, or secure industrial protocols) to reduce the risk of interception or tampering.
• System integrity controls: Mechanisms that help ensure systems and communications are not altered in an unauthorized way, such as message authentication, checksums, and anti-malware controls at endpoints that participate in communications.
• Cryptographic protections: Use of encryption, key management, and digital certificates to safeguard confidentiality and integrity of communications between systems.
• Segregation of duties and paths: Separating management traffic from production traffic, and logically separating networks that support safety-critical or regulated processes from general office networks.
• Monitoring and restriction of communications: Logging, intrusion detection or prevention, and allow/deny lists for ports, protocols, and services used between systems.

In a manufacturing plant, system and communications protection appears in practices such as hardening MES and SCADA servers, limiting which workstations can reach programmable logic controllers (PLCs), securing connections between the shop floor and cloud services, and controlling remote vendor access to equipment.

Operational context

From an operational standpoint, system and communications protection involves coordination between IT security, OT engineering, and quality/compliance teams. Typical activities include:

• Defining network architecture and zones for production, quality systems, and business systems.
• Setting and maintaining firewall rules and access control lists between OT and IT networks.
• Selecting and configuring secure protocols for data exchange among MES, ERP, historians, and equipment controllers.
• Documenting how regulated data (such as batch records or quality data) is protected while transmitted between systems.
• Periodically reviewing logs and alerts related to system and network communications.

Relation to NIST SP 800-53

Within NIST SP 800-53, System and Communications Protection is a defined control family (often referenced as “SC”). It groups controls that address the design and management of system boundaries, communication channels, and mechanisms that preserve confidentiality, integrity, and availability of information as it moves between components. Small manufacturers may prioritize this family alongside access control, configuration management, and incident response when tailoring a cybersecurity program.

Common confusion

System and communications protection is commonly confused with:

• Access control: Access control focuses on who or what is allowed to use a system or data. System and communications protection focuses on how systems and data flows are technically safeguarded, regardless of user identity.
• Network security: Network security is closely related but is often narrower, emphasizing network devices and traffic. System and communications protection typically includes network security plus host-level and application-level controls that affect how systems communicate.
• Physical security: Physical security protects facilities and hardware from physical threats. System and communications protection addresses logical and electronic protections of systems and data in transit.

Tie to regulated manufacturing

In regulated manufacturing, system and communications protection supports requirements for safeguarding production data, electronic records, and control systems that affect product quality or safety. It helps demonstrate that electronic exchanges between systems such as MES, LIMS, ERP, and equipment controllers are managed in a controlled manner and that data transmitted across network boundaries is protected against unauthorized access or tampering.