Dynamic Privacy Parameter Updates in Wireless Stations
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Solution Overview
Problem
Current wireless communication standards, such as IEEE 802.11, do not allow non-AP stations and AP stations to change their privacy parameters, like MAC addresses, while associated, leading to security issues and compromised user privacy.
Innovation Solution
A method is introduced where both non-AP and AP stations can change their privacy parameters by using a shared key and parameter to calculate a new value, which is then applied locally without exchanging the new values explicitly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stations use fixed privacy parameters (MAC addresses) for communication, then communication stability is maintained, but user privacy is compromised and tracking becomes possible
Solution Approach 1:
The patent implements dynamic privacy parameter changes by allowing stations to periodically update their MAC addresses and other privacy parameters while associated with an access point. This dynamic adjustment enables the system to maintain communication stability through controlled changes while preventing tracking by using different parameter values at different times.
Solution Approach 2:
The patent directly applies parameter changes by modifying privacy-enhancing parameters such as MAC addresses, BSSID, and association IDs. The system changes these parameters from fixed values to variable values that can be updated periodically, thereby preventing tracking while maintaining communication functionality through proper coordination between stations.
2Object-affected harmful factors
If non-AP stations change privacy parameters while associated with AP, then user privacy is enhanced, but communication coordination becomes complex
Solution Approach 1:
The patent applies preliminary action by having stations negotiate and agree on privacy parameter change schedules before actually changing the parameters. This advance coordination ensures that both the non-AP station and AP are prepared for the parameter changes, reducing communication disruptions and simplifying the coordination process compared to ad-hoc changes.
Solution Approach 2:
The patent implements feedback mechanisms where stations exchange information about their privacy parameter states and change timings. This feedback allows the AP and non-AP stations to coordinate their parameter changes, ensuring that both parties use consistent parameter values during communication and resolving any coordination issues that arise.
3Object-affected harmful factors
If AP station changes privacy parameters, then AP tracking is prevented, but station identification and management become difficult
Solution Approach 1:
The patent uses intermediary mechanisms such as association IDs and temporary identifiers that mediate between the need for privacy (changing MAC addresses) and the need for identification (AP managing stations). These intermediary identifiers allow the AP to track and manage station connections without exposing the actual privacy-enhancing parameters, thus preventing AP tracking while maintaining station identification capability.
4Object-affected harmful factors
If privacy parameters are changed frequently, then tracking protection is improved, but communication interruptions increase
Solution Approach 1:
The patent applies periodic action by implementing scheduled privacy parameter changes at predetermined intervals rather than frequently or randomly. This periodic approach balances tracking protection (by changing parameters regularly) with communication continuity (by allowing sufficient time between changes for stable operation), reducing unnecessary communication interruptions while maintaining privacy.
Data Source
AI summary
The present invention relates to method for changing the value of one or more privacy parameters, such as a MAC address, of target stations within a BSS, at both an AP station and a non-AP station associated with the AP station. The two stations share a pseudo-random function to generate the new values of the privacy parameters from a shared key and a shared parameter whose value varies over time. The methods comprise for each station: obtaining the shared key and parameter value; communicating, with the other station, a request for changing the values of the privacy parameters at a target time; calculating the new values by using the shared key and the current value of the shared parameter as inputs of the shared function; and replacing, in a registry, the current values of the privacy parameters of the target station by the calculated new values at the target time.