Centralized Security Device for Field Device Tamper Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional tamper protection systems for industrial field devices require a continuous power supply and involve high technical overhead due to local monitoring, which can be compromised if the power source depletes, and necessitate individual installation of tamper monitoring equipment.
Innovation Solution
A security device connected to tamper sensors via a network, providing cryptographic keys only if no manipulation is detected, eliminating the need for local power and reducing technical overhead by enabling remote tamper monitoring and using passive sensors that generate energy from physical manipulations or an electromagnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If local tamper monitoring is implemented in field devices, then tamper protection capability is improved, but device complexity and technical overhead increase
Solution Approach 1:
The tamper monitoring function is extracted from the field device and relocated to a centralized server. The server now handles tamper detection and cryptographic key management, while field devices only need to communicate authentication requests and receive keys, significantly reducing local complexity
Solution Approach 2:
The server performs multiple functions including tamper monitoring, cryptographic key generation, and authentication management for multiple field devices simultaneously. This centralized multi-functional approach replaces individual local tamper monitoring systems in each field device
2Reliability
If continuous power supply is provided for tamper monitoring, then monitoring reliability is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic authentication exchanges between field devices and the server. Tamper monitoring occurs at these periodic intervals during authentication, eliminating the need for continuous power supply while maintaining reliable detection capability
Solution Approach 2:
The authentication protocol itself serves dual purposes: both establishing cryptographic credentials and performing tamper monitoring. The periodic authentication exchanges automatically check for tamper conditions without requiring separate dedicated monitoring power
3Reliability
If individual tamper monitoring equipment is installed in each field device, then local protection is improved, but installation complexity and costs increase
Solution Approach 1:
Multiple individual tamper monitoring functions are merged into a single centralized server that serves all field devices. This consolidation reduces the total number of monitoring components needed and simplifies installation and maintenance
Solution Approach 2:
The server provides universal tamper monitoring and key management services to multiple field devices through the network, eliminating the need for device-specific local monitoring equipment and reducing overall system complexity
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 solution provides effective tamper protection without the need for continuous power and reduces implementation complexity, ensuring secure operation of field devices by only releasing cryptographic keys if no manipulation is detected, thus enhancing security and reducing costs.
Implementation Method 1
the security device is connected to at least one tamper sensor that is assigned to the field device and will emit a manipulation message upon detecting a physical manipulation carried out on the field device
Implementation Method 2
The security device is not attached to the field device requiring to be monitored but is connected to the field device via a network
Data Source
AI summary
A security device and a method provide a cryptographic key for a field device. The security device is connected to at least one tamper sensor which is associated with the field device and which, when a physical manipulation carried out on the field device is detected, a manipulation message is emitted. The cryptographic key is only provided to the field device by the security device if the security device does not receive a manipulation message from the tamper sensors associated with the field device.