Acoustic Key Exchange Through Plant Ductwork for Secure Control Links
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Solution Overview
Problem
Existing encrypted communication methods in process plants are inefficient at maintaining high data transmission rates while ensuring high access security, particularly in environments where unauthorized access is a concern.
Innovation Solution
The method involves transmitting encryption keys as acoustic signals through ductwork in process plants, using existing systems to secure key exchange between communication partners, thereby creating a physically isolated and secure secondary communication network, which can be retrofitted into existing plants without impairing data speeds or volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encrypted communication is implemented using traditional methods in process plants, then access security is improved, but data transmission rate and communication speed deteriorate
Solution Approach 1:
The communication system is segmented into two separate channels: a public data channel for high-speed data transmission and a secure acoustic channel for key exchange. This segmentation allows each channel to be optimized for its specific function, resolving the contradiction between security and transmission speed.
Solution Approach 2:
Acoustic signals serve as an intermediary medium for secure key transmission. The acoustic channel acts as a mediator that carries encryption keys independently from the data communication channel, enabling secure key exchange without impacting data transmission performance.
2Reliability
If a secure key exchange channel is established, then access security is improved, but system complexity and installation requirements worsen
Solution Approach 1:
The acoustic communication system utilizes existing infrastructure (ductwork, piping, structural elements) that already exist in process plants for other purposes. This multi-functionality approach allows the secure channel to be implemented without adding dedicated new infrastructure, reducing system complexity.
Solution Approach 2:
The system uses naturally occurring acoustic wave propagation through existing plant structures to establish secure communication. The infrastructure serves itself by providing both its original function and the additional function of secure key transmission without requiring complex active components.
3Reliability
If asymmetric encryption is used for complete message encryption, then access security is improved, but communication speed and efficiency deteriorate
Solution Approach 1:
The encryption process is segmented into two parts: asymmetric encryption is applied only to the encryption key while symmetric encryption is used for the actual data transmission. This segmentation allows the use of computationally intensive asymmetric encryption only where necessary for security, while maintaining high-speed symmetric encryption for bulk data transfer.
Solution Approach 2:
The encryption key is exchanged in advance through the secure acoustic channel before data transmission begins. This preliminary action allows the secure key to be established beforehand, enabling subsequent high-speed symmetric encryption without the overhead of repeated asymmetric encryption operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures fast and secure encrypted communication by utilizing existing ductwork as a secure channel for key transmission, preventing unauthorized access and enhancing operational safety without compromising data transmission rates or volumes.
Implementation Method 1
transmitting the key as acoustic signal from the acoustic send apparatus via the ductwork to the acoustic receive apparatus
Data Source
AI summary
In a method for the encryption communication in a process plant, one or more keys for coding of electronic signals regarding the process plant, such as actuation signals, measurement signals, state signals, warning signals or such, are provided. The one or more keys are transmitted as acoustic signal via a ductwork guiding plant fluid, particularly a process fluid or an auxiliary fluid, from the first communication partner to the second communication partner. The process plant can be a chemical plant, a power plant, or a food-processing plant. The communication can be between a first and a second communication partner, which can include at least one field device, such as an actuator for adjusting a process fluid and/or a control electronics for supervising, controlling and/or regulating processes of the process plant.