Vendor-Specific PHY Identifier Obfuscation Against Wireless Tracking
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Solution Overview
Problem
The introduction of vendor-specific PHY extensions in UHR wireless communication exposes devices to unauthorized tracking, as attackers can correlate packets with different MAC addresses based on consistent vendor-specific parameters, violating privacy requirements.
Innovation Solution
Obfuscate vendor IDs using transformation algorithms, generate temporary burner MAC addresses, and utilize dual BSSIDs to separate network traffic types, ensuring unique identifiers across overlapping BSSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vendor-specific PHY extensions are used in UHR wireless communication, then device functionality and vendor-specific optimizations are improved, but device privacy and security deteriorate due to unauthorized tracking
Solution Approach 1:
The patent segments the vendor identification process by introducing multiple vendor ID fields (first vendor ID in vendor info, second vendor ID in vendor-specific PHY extension) that can be independently managed. This segmentation allows the system to maintain vendor-specific functionality while enabling privacy protection mechanisms through selective use and obfuscation of different vendor ID fields.
Solution Approach 2:
The patent introduces an intermediary obfuscation mechanism that transforms the original vendor ID into an obfuscated version. This intermediary layer prevents direct correlation between vendor-specific parameters and device identity, allowing vendor functionality to operate while blocking unauthorized tracking attempts.
2Loss of information
If MAC address changes are implemented to protect privacy, then device anonymity is improved, but unauthorized tracking via vendor-specific parameters worsens
Solution Approach 1:
The patent applies parameter changes by transforming the vendor ID parameter through obfuscation algorithms. The vendor ID is modified into an obfuscated vendor ID that maintains functional utility for vendor-specific operations while changing its identifying characteristics to prevent tracking correlation across different MAC addresses.
3Reliability
If vendor ID obfuscation is applied, then device tracking prevention is improved, but network device coordination complexity worsens
Solution Approach 1:
The patent introduces dynamics by making vendor ID management adaptive and conditional. The system dynamically selects which vendor ID field to use based on operational context, and dynamically applies obfuscation transformations. This dynamic approach allows flexible coordination between network devices while maintaining privacy protection.
Solution Approach 2:
The patent implements periodic action through epoch-based vendor ID renewal. At defined epoch intervals, the system refreshes vendor ID assignments and obfuscation parameters, providing regular privacy protection updates while maintaining coordinated network operation through structured renewal cycles.
Data Source
AI summary
The present disclosure provides techniques to enhance privacy and security for wireless communications involving vendor-specific physical layer (PHY) extensions. A client device generates an obfuscated vendor identifier (ID) by applying one or more transformation functions to a real vendor ID. The client device generates an encrypted message, where the encrypted message comprises obfuscation data, which, when used, converts the obfuscated vendor ID into the real vendor ID. The client device transmits the encrypted message to an access point (AP). The client device transmits a data packet containing the obfuscated vendor ID to the AP.