Wireless Control Nodes With Time-Limited Program Switching
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Solution Overview
Problem
Existing wireless network protocols for controlling lighting, building, signaling, and sensor technologies, such as Zigbee, have security gaps due to shared encryption keys, which can compromise safety-related systems like traffic light control and building monitoring.
Innovation Solution
The system devices operate autonomously with pre-installed programs that cannot be changed via wireless interfaces, limiting potential hacker damage to selecting among pre-installed programs. The wireless interface is also restricted to receive instructions only within defined time windows, enhancing security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless protocols with encryption (e.g., Zigbee) are used for controlling lighting and building technology, then data transmission security is improved, but security vulnerabilities arise due to shared master keys that can be compromised
Solution Approach 1:
The patent segments the program memory into multiple individually protected program areas, each with its own access authorization. This allows different security levels for different functions, preventing a single compromised key from affecting the entire system. Each program area can be protected with different encryption keys or access methods.
Solution Approach 2:
The system performs preliminary security measures by establishing defined time windows for program changes and requiring explicit authorization before allowing any program modifications. This preliminary action prevents unauthorized changes by default, and only authorized changes within specific time windows are permitted.
2Adaptability or versatility
If the wireless interface allows frequent program changes for adaptability, then system flexibility is improved, but security risks increase due to more opportunities for unauthorized access
Solution Approach 1:
The patent implements periodic action by defining specific time windows during which program changes can occur. The wireless interface only accepts program change requests during these predetermined periods, automatically rejecting requests outside these windows. This maintains adaptability within controlled periods while preventing continuous unauthorized access attempts.
Solution Approach 2:
The system dynamically adjusts its security posture by switching between different operational modes: during time windows, the system accepts authorized program changes; outside time windows, it maintains a locked state. This dynamic behavior allows flexibility when needed while maintaining security during critical periods.
3Ease of operation
If the wireless interface remains continuously open for instructions, then ease of operation is improved, but security is compromised due to constant vulnerability to attacks
Solution Approach 1:
The wireless interface operates periodically rather than continuously, opening only during defined time windows to receive program change instructions. During these windows, the interface is accessible for authorized operations. Outside these windows, the interface remains closed, preventing unauthorized access while maintaining operational capability during permitted periods.
4Adaptability or versatility
If encryption keys are shared across multiple devices for network operation, then network compatibility is improved, but security is weakened due to the master key vulnerability
Solution Approach 1:
The patent segments the security architecture by creating multiple individually protected program areas, each with its own access control. Instead of relying on a single shared master key for the entire system, each program area can have different protection mechanisms, reducing the impact of key sharing while maintaining network compatibility.
Solution Approach 2:
Different security measures are applied to different program areas based on their specific requirements. Critical functions can have stronger protection than less sensitive functions. This local differentiation allows network compatibility through shared keys while enhancing security for specific vulnerable areas without requiring complete key restructuring.
Data Source
Figure 1
AI summary
The invention relates to a system device for operation in a network of several such system devices, comprising an implementation unit for the autonomous operation of a lighting device, building technology, signal technology and/or sensor technology, wherein the autonomous operation takes place according to a program which is stored in the system device, and a wireless interface for receiving instructions, wherein the instructions cause a change of the program to another program from a selection of programs, wherein the selection of programs is installed on the system device and is unchangeable or can only be changed by means of a wired interface of the system device.