Understanding the IT/OT Divide
Operational Technology (OT) and Information Technology (IT) represent two distinct domains with fundamentally different security priorities. According to the National Institute of Standards and Technology (NIST), OT refers to “programmable systems or devices that interact with the physical environment,” including industrial control systems, EPMS solutions, building management systems, and physical access control mechanisms. In contrast, IT encompasses equipment used for data processing, storage, and transmission.
While these systems increasingly incorporate IT components, they present unique vulnerabilities, risks, and security challenges due to their varying sub-segmentation on networks, and often legacy components that make up the solution. These legacy components, are vital to the operation, but often did not have security at the top of the priority list when they were deployed.
All of this said – the critical difference of IT to OT lies in their purpose: IT systems primarily manage data, while OT systems control physical processes. This distinction fundamentally shapes their security requirements and priorities.
The CIA Triad: Different Priorities for Different Domains
The Confidentiality, Integrity, and Availability (CIA) triad provides a framework for understanding cybersecurity principles. However, these principles are weighted differently for OT and IT systems:
- Confidentiality involves “preserving authorized restrictions on information access and disclosure.” While paramount in IT environments to protect sensitive data, confidentiality may be less critical for some OT systems.
- Integrity focuses on “guarding against improper information modification or destruction.” Both IT and OT systems require data integrity, but in OT environments, compromised integrity can lead to physical consequences.
- Availability ensures “timely and reliable access to and use of information.” For OT systems, particularly in energy, availability is absolutely critical. A power outage caused by a cybersecurity breach has immediate physical impacts, making availability the top priority for most OT environments.
This reordering of priorities—with availability often taking precedence over confidentiality in OT environments—represents a fundamental difference in security approaches between the domains.
Legislative Framework and Requirements
In recent years several key legislative and policy requirements govern OT cybersecurity, particularly for U.S. federal facilities. A sampling include:
Executive Orders:
- E.O. 13636 (2013): Improving Critical Infrastructure Cybersecurity
- E.O. 13800 (2017): Strengthening the Cybersecurity of Federal Networks and Critical Infrastructure. (Mandates the use of NIST’s Framework for Improving Critical Infrastructure Cybersecurity)
National Infrastructure Protection Plan (NIPP):
This plan identifies 16 crucial infrastructure sectors, including energy, and provides guidance on government-private sector partnerships to strengthen cybersecurity.
Risk Management Framework (RMF) and Federal Information Security Management Act (FISMA):
While FISMA primarily targets IT, it requires agencies to follow the RMF, which includes OT devices in comprehensive cybersecurity assessments.
Federal energy managers must navigate these requirements using various frameworks and tools developed by the Federal Energy Management Program (FEMP), including the Facility Cybersecurity Framework and Distributed Energy Resource Cybersecurity Framework. Its important to note however that although these recent legislative initiatives target federal work, they are guiding principles of where the private sector is going to assure reliability. Manufacturers are taking particular interest in these given it will impact product roadmaps over time through adoption.
OT-Specific Vulnerabilities and Risks
OT systems face unique cybersecurity challenges compared to their IT counterparts:
- Legacy Systems: Many OT systems operate for decades without replacement, often lacking basic cyber defenses and sometimes impossible to update.
- Cyber-Physical Convergence: The integration of IT and OT creates new attack surfaces where digital breaches can cause physical damage.
- Supply Chain Risks: Vulnerabilities may exist in hardware or software components from various vendors, creating downstream risks.
- Physical Consequences: Unlike IT breaches that primarily affect data, OT attacks can cause equipment damage, operational disruptions, and even endanger human safety.
Real-world examples illustrate these risks. In one case, researchers demonstrated how a Raspberry Pi could intercept messages to a wind turbine controller and stop the turbine from turning. In another incident, a denial-of-service attack on a building automation system in Finland rendered heating systems inoperable for days.
Essential Security Measures for OT Environments
Protecting OT systems requires specific security approaches while also adhering to the realities that OT and IT networks are converging on the same “wire”. Several of these include:
- Access Control: Implement strict authentication and authorization based on the principle of least privilege, ensuring users only access what they need for their specific roles.
- Patch Management: While challenging for legacy OT systems, updating software and firmware when possible is crucial to address vulnerabilities.
- Asset Management: Maintain comprehensive inventories of OT devices and updated network configuration diagrams to facilitate maintenance and incident response.
- Network Hardening: Separate IT and OT networks, remove unauthorized connections, close unused ports, and disable unnecessary services to reduce the attack surface.
These measures must be tailored to the unique requirements of OT environments, recognizing their physical impacts and operational priorities.
APT is Here to Help
APT specializes in designing, upgrading and supporting EPMS and SCADA solutions for complex critical facilities. Our expertise bridges the gap between IT and OT security, recognizing the unique challenges of systems that control physical processes.
APT delivers comprehensive energy monitoring and management solutions that address the specific needs of commercial infrastructure. We recognize that availability is paramount in power systems, while also ensuring appropriate confidentiality and integrity protections.
Contact APT today for a comprehensive evaluation of your OT security needs. Our experts will help you navigate the complex landscape of regulations, frameworks, and technical requirements to ensure your critical power monitoring and management systems remain secure and reliable.
A Glossary of Key Terms
Term | Definition |
Operational Technology (OT) | Systems that interact with the physical environment, including industrial controls and building management systems |
Information Technology (IT) | Equipment used for data processing, storage, transmission, and management |
SCADA | Supervisory Control and Data Acquisition systems used to monitor and control industrial processes |
CIA Triad | Confidentiality, Integrity, and Availability – core principles of information security |
Risk Management Framework | NIST methodology for managing organizational risk |
Vulnerability | Weakness in a system that could be exploited by threats |
Denial of Service | Attack preventing authorized access to resources or delaying critical operations |
Asset Management | Process of tracking and managing all hardware and software components |
Network Hardening | Process of securing a network by reducing vulnerabilities |
Least Privilege | Security principle of providing minimal access rights needed for job functions |
