Control Device Access Token Switching for Secure Automation Configuration
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Solution Overview
Problem
Industrial automation systems require secure and simple configuration methods to enable external access for maintenance while preventing security intrusions, which existing solutions often fail to provide effectively.
Innovation Solution
A method for configuring a control device in an automation system that detects a local access token to modify parameters for network access, allowing temporary external access while ensuring secure state restoration, using various interfaces such as USB, RFID, or NFC for authentication and parameter modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external network access is enabled for configuration and maintenance, then ease of operation is improved, but security reliability deteriorates due to potential intrusions
Solution Approach 1:
A USB interface acts as an intermediary between the external configuration device and the control device. The interface detects a local access token (USB stick) that must be present to enable configuration mode, thereby mediating access and preventing direct unauthorized network connections. This resolves the contradiction by requiring physical token presence for ease of operation while maintaining security through the intermediate authentication layer.
Solution Approach 2:
Before enabling network configuration access, the system performs preliminary authentication by detecting the local access token via the USB interface. The configuration mode is only activated after this preliminary security check, ensuring that ease of operation is provided only to authorized users while maintaining security reliability through pre-validated access.
2Reliability
If network access is restricted for security, then security reliability is improved, but ease of operation deteriorates due to inability to perform remote configuration
Solution Approach 1:
The network access state is made dynamic rather than static. The control device switches between a restricted secure state (default) and an enabled configuration state (when USB token is detected). This dynamic adjustment resolves the contradiction by providing security reliability as the default state while enabling ease of operation temporarily when authenticated, allowing remote configuration only when needed and authorized.
3Reliability
If complex authentication mechanisms are implemented, then security reliability is improved, but device complexity increases
Solution Approach 1:
The system uses a simple, inexpensive USB stick as the local access token instead of complex cryptographic authentication systems. The USB stick serves as a disposable or replaceable authentication object that provides adequate security for configuration access without requiring complex authentication mechanisms. This resolves the contradiction by providing acceptable security reliability through a simple, low-cost token while minimizing device complexity.
Data Source
AI summary
The disclosure relates to a method for configuring a control device of an automation system, comprising: detecting a local access token via an interface of the control device; and modifying at least one parameter of the control device, which is designed to configure a data connection of the control device in response to the detection of the local access token.