Wireless Network Attack Mitigation via Selective Acknowledgement
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Solution Overview
Problem
Wireless communication networks face excessive operations attacks, which overwhelm nodes with a flood of messages, leading to denial-of-service issues and memory capacity problems with existing solutions like blacklisting, which are not scalable due to the rapid creation of new MAC addresses by attackers.
Innovation Solution
Implementing a selective acknowledgement technique in access nodes to mitigate excessive operations attacks by ignoring initial unacknowledged requests and validating retry requests based on MAC addresses, timestamps, and sequence numbers, thereby reducing messaging overhead and memory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blacklisting stations causing excessive operations is implemented, then the node is protected from attack messages, but memory capacity is consumed and the solution is not scalable
Solution Approach 1:
The patent extracts only the essential identifying information (MAC address and sequence number) from attack messages into a lightweight filter structure, rather than storing complete message content. This extraction approach protects the node from attacks while consuming minimal memory resources, directly resolving the contradiction between protection reliability and memory capacity.
Solution Approach 2:
The patent changes the parameter of storage requirements by implementing a state machine that tracks only sequence numbers and MAC addresses rather than storing full message content. This parameter change enables scalable protection against excessive operations attacks with constant memory usage regardless of attack volume.
2Productivity
If all messages are processed normally, then legitimate communications are maintained, but the node crashes or stops beaconing under attack
Solution Approach 1:
The patent implements preliminary action by pre-configuring sequence number counters and state machine transitions before attacks occur. The filter is pre-loaded with valid MAC addresses and the state machine is pre-configured with transition rules, enabling the node to automatically differentiate and process legitimate messages while dropping attack messages without crashing, thus maintaining both productivity and reliability.
Solution Approach 2:
The patent employs feedback mechanisms where the state machine continuously monitors message sequence numbers and adjusts its filtering behavior based on detected patterns. When excessive operations are detected, the system feedback loops to increment counter values and transition states, dynamically adapting message processing to maintain node stability while preserving legitimate communications.
3Reliability
If message validation is implemented, then spoofed packets are mitigated, but messaging overhead increases
Solution Approach 1:
The patent applies partial validation by checking only critical fields (sequence number continuity and MAC address validity) rather than performing exhaustive message validation. This partial action approach mitigates spoofed packets while minimizing messaging overhead, as the filter only examines essential identifying parameters rather than complete message content.
Data Source
AI summary
A technique for mitigating excessive operations attacks in a wireless communication network includes receiving message requests from stations, detecting an excessive operation attack, checking if a received request is a first request or a retry request, and ignoring any first requests. The method can also include saving information about the first request, and wherein if checking reveals that the received request is a retry request, the method further confirms that the retry request and the saved information about the first request meet matching conditions, whereupon the retry request is further processed as normal. Since attacks rarely utilize retry requests, this technique effectively ignores attack messages.