Removable Security Module for Process Control Authentication
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Solution Overview
Problem
Current process control systems face challenges in securing safety instrumented systems, particularly when integrated within the control systems, as traditional security measures can be compromised, leading to unauthorized changes and potential hazards. The existing methods for updating or replacing security features in control devices are time-consuming and costly, requiring devices to be taken offline and reconfigured.
Innovation Solution
A removable security module that provides authentication, authorization, and encryption services for control devices, allowing for flexible and reliable security management. This module can be easily swapped with updated versions without altering the control device, enabling standardized security features across different devices and manufacturers, and facilitating two-person authorization protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If security features are integrated within process control systems, then system complexity is reduced and cost is lowered, but security vulnerability increases and unauthorized access becomes more likely
Solution Approach 1:
The patent divides the process control system into separate functional modules: a process control device and a removable security module. The security module is a distinct component that can be physically separated from the control device, allowing security functions to be isolated while maintaining overall system integration. This segmentation enables the control device to operate with reduced complexity while the dedicated security module provides specialized security protection.
2Ease of manufacture
If traditional security measures are used in integrated systems, then implementation is simpler, but security can be compromised and unauthorized changes occur
Solution Approach 1:
The patent extracts security functions from the main process control device into a separate removable security module. This extracted module contains dedicated security processing capabilities, authentication mechanisms, and encryption functions that are not present in the standard control device. By taking out these critical security functions, the system maintains ease of implementation for the control device while significantly improving resistance to security compromises.
3Stability of the object's composition
If security modules are permanently integrated, then security is stable, but updates and replacements are time-consuming and costly
Solution Approach 1:
The patent implements a dynamic security module that can be removed and replaced without affecting the permanent components of the control device. The removable design allows security modules to be dynamically updated by simply detaching an old module and attaching a new one, eliminating the need for complex reconfiguration procedures. This dynamic approach maintains security stability during operation while enabling rapid updates when security requirements change.
4Adaptability or versatility
If multiple device variants are created for different security needs, then security customization is improved, but device complexity and inventory requirements increase
Solution Approach 1:
The patent creates a universal control device platform that can work with multiple different security modules through standardized interfaces. The control device is designed with generic communication protocols and connection mechanisms that are compatible with various security module types. This universality allows a single control device model to support multiple security configurations by simply changing the removable module, eliminating the need to manufacture multiple variants of the control device itself.
Data Source
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AI summary
Example removable security modules for use with process control devices and related methods are disclosed. An example removable security module includes a body configured to be removably coupled to the process control device and a memory disposed in the body with a shared secret stored in the memory. The example removable security module also includes a processing unit disposed in the body, coupled to the memory and configured to read information from the process control device, compare the information to the shared secret and authenticate the process control device based on the comparison.