Unified Group Key Wireless Network Security
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Solution Overview
Problem
Existing wireless networks face challenges in securing group addressed data packets, as existing solutions require complex key management and distribution, leading to increased storage and processing overhead, and lack effective mechanisms to prevent unauthorized access after temporary membership expires.
Innovation Solution
Implementing a unified group key across all nodes in a wireless network for encryption and decryption of multicast layer-2 packets, with a border router generating and updating the group key and passphrase periodically to ensure secure transmission and prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex key management and distribution mechanisms are implemented for group addressed data packets, then security is improved, but storage and processing overhead increases
Solution Approach 1:
The patent merges the key management functions into a centralized border router that generates and distributes group keys to all nodes. Instead of each node managing its own keys independently, the system combines key generation, distribution, and renewal operations into a single centralized entity, reducing overall system complexity while maintaining security
Solution Approach 2:
The border router performs multiple functions: it acts as a regular network node for packet forwarding, simultaneously serves as a key management server for generating and distributing group keys, and functions as an authentication point for renewing member access. This multi-functionality eliminates the need for separate key management infrastructure
2Reliability
If individual group keys are distributed to each node for multicast packets, then security is improved, but storage requirements increase
Solution Approach 1:
The patent combines all group keys into a single centralized storage location at the border router. All nodes share the same group key for encrypting and decrypting multicast packets, eliminating the need for each node to store multiple individual group keys. This significantly reduces storage requirements while maintaining security through centralized key management
3Adaptability or versatility
If temporary membership access is granted to nodes, then network flexibility is improved, but unauthorized access after expiration becomes a risk
Solution Approach 1:
The patent implements periodic key renewal where the border router generates new group keys at regular intervals and distributes them to all active members. This periodic action ensures that temporary members must continuously validate their membership status to maintain access, automatically revoking access when membership expires without requiring active monitoring
Solution Approach 2:
The system incorporates feedback mechanisms where nodes send membership status updates to the border router, and the border router responds by distributing renewed group keys only to authenticated members. This feedback loop ensures that access control decisions are based on current membership status, preventing unauthorized access after expiration
Data Source
AI summary
A wireless network includes a border router, multiple router nodes and end devices. All nodes of the wireless network use a same group key for encryption and decryption of payloads of multicast layer-2 packets. A router node of the wireless network receives a group key from its parent node, and forwards the group key to its child nodes. The router node receives a layer-2 multicast packet with a payload specifying a multicast layer-3 address. The router node decrypts the payload using the group key. If at least one child node of the router node belongs to a group corresponding to the multicast layer-3 address, the router node forwards the encrypted payload as a layer-2 multicast packet to corresponding child nodes. Use of a same group key across all nodes of the wireless network reduces storage space in a node for storing group keys, and also simplifies group key handling.