The Myth of the “Air Gap”
For decades, operational technology (OT) was protected by a simple concept: the “air gap.” This was the physical separation of industrial machinery and control systems from the corporate internet.
Today, in the modern era of IoT, remote monitoring, and integrated supply chains, the permanent air gap is largely an illusion. Yet, we still regularly encounter clients who firmly believe their industrial systems are safely isolated. The reality is often quite different. A common, real-world example we see is a third-party vendor bringing a laptop on-site for routine maintenance or troubleshooting. The moment that laptop connects to the industrial network after being connected to the outside world, the air gap is bridged, and the network is compromised.
If your facility or remote mine site is using an integrated IT/OT network without a specialised industrial security playbook, you are effectively a “sitting duck” for sophisticated threat actors.
Why Standard IT Security Fails in an OT Environment
You cannot simply “copy and paste” corporate IT security policies into a process control network (PCN). Doing so is not only ineffective, it can be actively dangerous to your operations.
- Legacy Limitations: Many OT assets, such as PLCs and SCADA systems, were designed 15 to 20 years ago without modern security in mind. Deploying standard IT scanning tools to search for vulnerabilities can inadvertently overwhelm and crash these highly sensitive devices.
- Availability First: In the corporate IT world, “Confidentiality” is king; if a threat is detected, you shut the server down to protect the data. In the OT world, “Availability” is the absolute priority. You cannot simply reboot a processing plant or a refinery to install a software patch.
3 High-Stake Risks to Industrial Assets
When OT security is neglected, industrial environments face unique, high-stakes risks:
- Lateral Movement: Attackers rarely attack the industrial control system directly. They often enter through a less-secure vector, like corporate Wi-Fi or a phishing email, and “pivot” laterally into the OT environment.
- Denial of Service (DoS): Stopping a production line doesn’t just cost data; it costs millions of dollars in lost operational time and creates massive, real-world physical safety risks for your personnel on the ground.
- Data Exfiltration: Proprietary operational data, such as real-time mine site telemetry or proprietary chemical formulas, is a high-value target for industrial espionage.
Securing the Attack Surface: A Standards-Based Approach
Securing the industrial estate requires a multi-layered defence strategy that respects the unique architectural requirements of the PERA (Purdue Enterprise Reference Architecture) model. It requires a partner who understands both the server room and the plant floor.
At Denver Technology, our approach to OT security is strictly anchored in global best practices. We lead with the ISA/IEC 62443 standard to ensure robust security lifecycles for industrial automation and control systems, while also adhering closely to CSIA guidance and NIST frameworks.
Identifying and Closing Your Vulnerabilities
You cannot protect against gaps you don’t know exist. To help industrial clients understand their true risk profile and uncover hidden bridges in their networks, Denver Technology runs a comprehensive suite of proactive security services.
Rather than waiting for a breach, we help you prepare through:
- Cyber Desktop Incident Exercises (Tabletop simulations to test your team’s response)
- Internal and External Penetration Testing (Safely probing your defences)
- Cyber Policy Reviews (Ensuring governance matches operational reality)
- Incident Response Planning (Having a concrete playbook for when the worst happens)
- Comprehensive OT Security Assessments
Don’t leave your most critical assets exposed.
Stop relying on the myth of the air gap. Partner with experts who specialise in the complex intersection of IT and OT. Visit our IT/OT Cyber Security page to learn how Denver Technology can secure your operations today.