Security Coordinator Group Key Management for Home Area Networks
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Solution Overview
Problem
In home area networks, existing authentication systems face challenges in managing group keys effectively, particularly when multiple controllers are present, as they may experience power cutoffs or network disconnections, leading to communication failures and inability to update or share group keys, which hinders secure encrypted communication among devices.
Innovation Solution
An authentication method where one controller, designated as the Security Coordinator (SC), manages the group key, performs mutual authentication with devices and other controllers, and updates the key when necessary, ensuring continuous secure communication by selecting a suitable controller based on attributes such as power availability and network connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all controllers in the group manage group keys independently, then each controller can maintain secure communication autonomously, but the system complexity increases and communication failures occur when controllers experience power cutoffs or network disconnections
Solution Approach 1:
The patent designates one controller as a key management coordinator that acts as an intermediary for group key management. This coordinator centrally manages group key generation, distribution, and updates, eliminating the need for each controller to independently manage keys. This reduces key management complexity while improving reliability by ensuring consistent key management across the group, preventing communication failures due to power cutoffs or network disconnections of individual controllers.
2Productivity
If manual intervention is required for group key updates, then security can be tightly controlled, but the processing load increases and new devices cannot join automatically
Solution Approach 1:
The patent implements automatic group key update mechanisms where the key management coordinator autonomously generates new group keys and distributes them to all controllers and devices in the group without requiring manual intervention. This enables new devices to join the network automatically and receive group keys seamlessly, improving device joining speed while maintaining security through automated key rotation and distribution protocols.
3Reliability
If group keys are updated frequently, then security is enhanced, but the network traffic increases and communication efficiency decreases
Solution Approach 1:
The patent implements periodic group key updates where the key management coordinator generates new group keys at predetermined time intervals and distributes them to all group members. This periodic update mechanism enhances security by regularly rotating keys while controlling network traffic and energy consumption by updating keys only when necessary, rather than continuously or too frequently. The system balances security requirements with network efficiency through this time-based update strategy.
Data Source
AI summary
In an authentication method, a first controller generates a first group key, executes first mutual authentication with devices within a group, and shares the first group key with devices that have succeeded in the first mutual authentication. When a second controller joins the group, the first controller decides which coordinator manages a group key used in common. The first controller executes second mutual authentication with the coordinator, and shares the first group key with the coordinator when the second mutual authentication is successful. The coordinator performs encrypted communication within the group using the first group key, generates a second group key when the first group key valid time runs out and before updating the first group key, executes third mutual authentication with the devices and a third controller, and updates the first group key of the devices and the third controller that have succeeded in the third authentication.