Trystan Casey
Air gapping is a method used to protect critical computer systems or data from potential attacks by physically segregating them from other computers or network devices. This means that air-gapped computers cannot connect to wireless networks or the internet and must rely on physical media, such as thumb drives, to transfer data. While air-gapped systems provide a higher level of security, they are still vulnerable to attacks through electromagnetic leakage and malware introduced via USB devices. Additionally, maintaining air-gapped systems requires more manual input for updates and patches. In the context of electrical work, air gapping refers to the physical separation between what is being worked on and what is not, providing a visual confirmation of disconnection from any service.
Characteristics and Values of Air Gapping an Electrical Connection
| Characteristics | Values |
|---|---|
| Definition | An air gap is a security measure used to isolate multiple systems from linking, such as a computer connecting to Wi-Fi. |
| Purpose | To prevent electromagnetic exploits, provide a visible and definite disconnection from any type of service, and protect critical computer systems or data from potential attacks. |
| Examples | National and state lottery game machines, digital thermostats, electronic sprinkler controls, and magnetic circuits. |
| Data Transfer | Data is transferred between an air-gapped system and other systems using removable media devices such as USB drives or thumb drives. |
| Limitations | Air-gapped systems are susceptible to electromagnetic leakage, which can be intercepted by malicious actors. They are also vulnerable to attack through infected USB devices and acoustic, FM frequency, and cellular frequency signals. |
| Maintenance | Air-gapped systems require manual updates, as they cannot connect to the internet to update software automatically. |
| Space | There is usually a specified amount of space between the air-gapped system and the outside walls, as well as between its wires and the wires of other technical equipment, to prevent electromagnetic radiation escape. |
| Physical Separation | Air-gapped computers have their wireless interface controllers disabled or removed, and they are physically segregated from other computers or network devices. |
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What You'll Learn
Air gapping in magnetic circuits
An air gap in a magnetic circuit is a non-magnetic part of the circuit, usually connected magnetically in series with the rest of the circuit. This allows a substantial part of the magnetic flux to flow through the gap. The air gap can be filled with a non-magnetic material such as gas, water, vacuum, plastic, or wood, and not necessarily just air.
Air gaps are important in magnetic circuits for several reasons. One of the main reasons is to increase the reluctance of the magnetic circuit. By increasing the amount of air or non-magnetic material in the circuit, the reluctance increases, which in turn increases the amount of current that can be put into a coil before reaching saturation. This helps to prevent magnetic saturation of the core due to direct current (DC) flowing through the coils. Additionally, air gaps allow the magnetic flux to expand outside the magnetic circuit, a phenomenon known as flux fringing.
The size and shape of the air gap can vary depending on the type and shape of the magnetic circuit. In some circuits, the air gap is an integral part that ensures the correct performance of the device. However, in other cases, it should be minimised to reduce the negative impact on performance. For example, in rotating machines, the air gap is usually unwanted as it requires extra power to overcome the added reluctance. On the other hand, a larger air gap in a synchronous generator is associated with a higher short-circuit ratio, which is often desirable.
Air gaps are also important for safety and maintenance purposes. A visible air gap between contacts provides a definite disconnection from any type of service, giving workers a sense of security during maintenance or demolition work. This concept of air-gapping is also applied to electrical systems to ensure physical separation and prevent accidental activation or connection.
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Air gapping in synchronous generators
Air gapping refers to the physical separation between two things that are magnetically or electrically connected. In synchronous generators, air gapping is an important concept in the design and operation of these machines.
Synchronous generators are rotating electrical machines that work by generating a magnetic flux through copper windings in the stator and rotor. The air gap is the space between the stator and the rotor, and it is where the magnetic field is formed. The magnetic flux must move through the air gap and cross it twice for each pole that the electrical machine has for each phase.
The air gap is a critical component of the synchronous generator because it is the interface between mechanical and electrical forces. The size of the air gap affects the performance of the generator. As the air gap increases in size, the magnetic attraction force decreases and becomes more difficult to control. Additionally, a larger air gap requires a higher magnetizing current, which is the amount of current needed to drive the magnetic flux through the air gap.
It is important to monitor the air gap in synchronous generators to ensure optimal performance and to detect any operating problems. Monitoring the air gap can help identify issues such as eccentricity, imbalance, misalignment, and bearing problems. Capacitive sensors can be installed on the stator to measure the air gap under different operating conditions.
In some cases, air gapping can also refer to the intentional gap left in magnetic materials or networks to isolate them from other systems. This can be done to improve security or to minimize magnetic saturation. For example, in stationary devices like inductors and transformers, an air gap can be used to reduce the effects of iron loss and increase the effective inductance.
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Air gapping in networking
In networking, air-gapped computers have their wireless interface controllers disabled or removed entirely. This means that to transfer data between an air-gapped system and other devices, physical media like thumb drives or USBs must be used, requiring physical access and movement between computers. This method is more secure than a direct full network interface, which can be vulnerable to external attacks.
Air gapping is particularly useful for systems with extremely sensitive data, as it prevents electromagnetic radiation from escaping and falling into the wrong hands. Examples of air-gapped networks include national lottery machines, digital thermostats, and electronic sprinkler controls.
Despite the security benefits, air-gapped networks are not entirely invulnerable. Researchers have demonstrated methods of data exfiltration from air-gapped computers using acoustic, FM frequency, and thermal signalling. Additionally, infected USB devices can be used to remotely leak data from these systems, highlighting the potential for human error and insider attacks.
To enhance security, organisations can employ measures such as Faraday cages to prevent electromagnetic leakage and user security awareness training to protect against potential threats like the infamous Stuxnet worm.
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Air gapping to prevent electromagnetic exploits
Air gapping is a security measure that isolates a computer or network from external networks, especially the internet, to protect against unauthorised access and cyber threats. Air-gapped computers have their wireless interface controllers disabled or removed entirely. This means that data transfer between an air-gapped system and other networks must be done manually, using physical storage devices like USB drives.
While air gapping offers protection from external cyber threats, it does not protect against all vulnerabilities. Air-gapped systems are still susceptible to electromagnetic leakage, which can be analysed and used to attack the system. Electromagnetic attacks can also intercept keystrokes or screen images from demodulated electromagnetic radiation waves. To prevent electromagnetic exploits, a specified distance is usually maintained between the air-gapped system and outside walls, as well as between its wires and those of other technical equipment. In the case of extremely sensitive data, a Faraday cage can be used to prevent electromagnetic radiation from escaping the air-gapped equipment.
Despite these measures, air-gapped networks have been shown to be vulnerable to attack in various circumstances. For example, malware can be transmitted to an air-gapped computer via an infected USB device. In addition, researchers have demonstrated methods of data exfiltration from an air-gapped computer to a nearby mobile phone using FM frequency signals, or over cellular frequencies.
The implementation of air-gapped systems also presents several challenges. The process of updating and maintaining these systems is complex, as they cannot connect directly to the internet for updates and patches. As a result, updates must be downloaded and installed manually, which can be time-consuming and prone to human error. Air-gapped systems also require a separate physical infrastructure, which can be costly and space-consuming. Furthermore, even with robust physical security measures in place, insider threats and accidental breaches can still compromise the integrity of an air-gapped system.
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Air gapping for physical separation
In the context of electrical connections, air gapping refers to creating a visible and definite physical separation between active and inactive components. For example, during demolition or maintenance work, a gap of a few inches in cables or pipes provides a clear indication of disconnection from any service. This visible air gap offers assurance to workers that they are safely interacting with an inactive system.
Air gapping is also commonly employed in computer networks to protect critical systems and data. An air-gapped computer is physically segregated and incapable of connecting wirelessly or physically with other devices. Data transfer to and from an air-gapped system is carefully controlled and often requires the use of removable media devices like USB drives. This manual process of transferring data can be labour-intensive and time-consuming but provides an additional layer of security.
While air gapping offers robust protection, it is not without its challenges. Air-gapped systems face difficulties in staying updated as they cannot connect directly to the internet for automatic updates. Manual updates require meticulous planning and execution, leaving room for human error and potential security breaches. Additionally, air-gapped systems are still susceptible to electromagnetic leakage, which can be exploited by malicious actors.
To mitigate electromagnetic threats, air-gapped systems are typically positioned with specified distances between their components and surrounding structures. In highly sensitive scenarios, a Faraday cage may be employed to contain electromagnetic radiation. Despite these precautions, air-gapped systems have been shown to be vulnerable to various attack methods, including malware, acoustic signalling, and electromagnetic exploits.
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Frequently asked questions
Air gapping is a security measure that involves physically separating two electrical connections to prevent any potential connection or interference.
Air gapping is used to protect critical computer systems or sensitive data from potential attacks like malware, ransomware, and keyloggers, as well as electromagnetic exploits.
Examples of air-gapped networks include national lottery machines, digital thermostats, and electronic sprinkler controls. These systems are isolated from networks to prevent fraud or interference.
Data is transferred to an air-gapped system through removable media devices such as USB drives or thumb drives. This process requires physical access and careful control to prevent malware infections.
While air-gapped systems enhance security, they are not entirely invulnerable. They can still be susceptible to electromagnetic leakage, human error, and advanced malware designed to exploit air-gapped systems.
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