Encrypted Permanent MAC Exchange for Private Wi-Fi Services

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Solution Overview

Problem

Existing wireless networks struggle to provide MAC address privacy and differentiated services in home and automotive environments, as randomized MAC addresses hinder applications that require user identification and differentiated treatment based on permanent MAC addresses.

Innovation Solution

Wireless devices connect with randomized MAC addresses for privacy and send encrypted permanent MAC addresses upon request, using encryption and policy-based decisions to maintain compatibility and enable differentiated services.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If randomized MAC addresses are used for privacy, then user privacy is improved, but MAC address-based services like QoS prioritization and parental controls cannot be provided

Engineering Contradiction:

Improveuser privacyVSAvoidMAC address-based services

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent segments the MAC address into two distinct components: a randomized part for privacy protection and a permanent part for service identification. The wireless device transmits both the randomized MAC address (for privacy) and the permanent MAC address (for services), allowing the system to maintain both privacy and service capability simultaneously by processing these segmented components separately

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism where the wireless device acts as a mediator between privacy requirements and service requirements. The device receives service requests, determines whether to provide permanent MAC address information based on policy, and selectively transmits encrypted permanent MAC addresses only when needed for service provision, thus mediating between privacy preservation and service enablement

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If permanent MAC addresses are used for identification, then differentiated services can be provided, but user privacy is compromised

Engineering Contradiction:

Improvedifferentiated servicesVSAvoiduser privacy

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by making different parts of the MAC address handling process have different properties: the randomized MAC address is used locally for privacy protection in wireless communications, while the permanent MAC address is used locally for service identification when needed. Each component serves its specific local function without compromising the other, allowing differentiated services to be provided only when and where necessary while maintaining privacy by default

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If encrypted permanent MAC addresses are transmitted, then both privacy and differentiated services are enabled, but device complexity increases

Engineering Contradiction:

Improveprivacy and differentiated servicesVSAvoidMAC address handling

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamics by making the MAC address handling process adaptive and configurable. The wireless device dynamically determines whether to transmit the permanent MAC address based on service requests and policy settings. The system can flexibly switch between privacy-mode (transmitting only randomized MAC) and service-mode (transmitting encrypted permanent MAC), allowing the complexity to be activated only when needed rather than being permanently increased

Inventive Principle:

Principle #15Dynamics

4Object-affected harmful factors

If MAC address randomization is enabled, then privacy is improved, but compatibility with devices requiring permanent MAC identification deteriorates

Engineering Contradiction:

ImproveprivacyVSAvoiddevice compatibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent achieves universality by designing a multi-functional MAC address handling mechanism that can operate in multiple modes: privacy mode (using only randomized MAC addresses), service mode (using encrypted permanent MAC addresses), and hybrid mode (using both). This allows the system to be universally compatible with both privacy-conscious devices and service-requiring devices, with each device type utilizing the appropriate functionality based on its needs

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12490085B2Media access control (MAC) address privacy handling

Publication Date: 2025.12.02 INFINEON TECHNOLOGIES AMERICAS CORP

AI summary

Implementations disclosed describe techniques to allow wireless devices to initially connect with randomized MAC addresses and send an encrypted permanent MAC for differentiated services. In one method, a first wireless device connects to an access point (AP) using a randomized MAC address. The first wireless device receives a request for a permanent MAC address from the AP. The first wireless device determines whether to send the permanent MAC address. Responsive to determining to send the permanent MAC address, the first wireless device encrypts the permanent MAC address to obtain an encrypted MAC address and sends a response to the request, including the encrypted MAC address, to the AP.