PMK Lifetime Margin Time Wireless Reconnection
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Solution Overview
Problem
The existing Wi-Fi security protocols, particularly WPA3, face inefficiencies in reusing pairwise master keys (PMKs) due to their short lifetimes, leading to frequent disconnections and user inconvenience.
Innovation Solution
An electronic device is configured to identify the presence of a PMK security association (PMKSA) when reconnecting to an access point (AP) and determine whether to reuse a PMK by comparing its lifetime with a margin time, ensuring guaranteed usage of the PMK.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the PMK lifetime is extended to reduce disconnection frequency, then connection stability is improved, but security risk increases due to potential key compromise over longer periods
Solution Approach 1:
The patent implements dynamic PMK lifetime management by introducing a margin time parameter that adjusts the effective lifetime of PMK based on usage conditions. The system dynamically determines whether to reuse a PMK by comparing its remaining lifetime against the margin time, allowing flexible adaptation between connection stability and security requirements based on real-time conditions rather than using a fixed lifetime value.
2Productivity
If the PMKSA is reused frequently to improve connection efficiency, then authentication overhead is reduced, but the risk of using expired or compromised keys increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the margin time parameter in the PMKSA before actual connection attempts. This pre-computed margin time serves as a safety buffer that is prepared in advance, allowing the system to quickly determine key validity during reconnection without complex real-time calculations, thus maintaining both efficiency and reliability.
Solution Approach 2:
The system implements feedback by continuously monitoring the PMK lifetime and comparing it against the stored margin time parameter. This feedback mechanism ensures that PMKSA reuse decisions are based on current key validity status, preventing the use of expired or compromised keys while maintaining efficient reconnection processes.
3Ease of operation
If the margin time is set to a high value to ensure PMK usability, then connection stability is improved, but the time window for potential key compromise increases
Solution Approach 1:
The patent employs parameter changes by introducing the margin time as a configurable parameter that can be adjusted based on security policies and usage patterns. Rather than using a fixed or extreme value, the margin time parameter allows fine-tuned control over the balance between PMK usability and vulnerability window, enabling optimization for different operational contexts.
Data Source
AI summary
An electronic device may include at least one wireless communication module configured to transmit and receive a wireless signal; a memory electrically configured to store instructions; and at least one processor operatively connected to the at least one wireless communication module and the memory, the at least one processor being configured to execute the instructions to: based on an attempt to connect to an access point (AP), identify whether a pairwise master key security association (PMKSA) for the AP, generated based on to a previous connection of the electronic device to the AP, is present, and based on identifying that the PMKSA is present, determine whether to reuse a pairwise master key (PMK) stored in the PMKSA by comparing a lifetime of the PMK with a margin time in which a use of the PMK is guaranteed.