Bluetooth Sub-Headset Key Exchange via Terminal Mediation
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Solution Overview
Problem
Existing Bluetooth headset systems face challenges in securely managing link information between sub-headsets and terminals, particularly in ensuring secure key exchange and monitoring of interactive information.
Innovation Solution
The implementation of a Bluetooth device with multiple sub-devices sharing a same public-private key pair, where a first sub-device transmits monitoring instruction information to a second sub-device, enabling the second sub-device to snoop and determine link information based on the shared key pair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first sub-headset transmits link information directly to the second sub-headset, then the pairing process is simple, but the security is compromised as sensitive data is transmitted
Solution Approach 1:
The patent introduces a terminal as an intermediary device that facilitates secure key exchange between sub-headsets. Instead of direct transmission, the terminal mediates the communication by receiving public keys from both sub-headsets and computing shared secrets, thereby eliminating the need for direct sensitive data transmission while maintaining pairing functionality
Solution Approach 2:
The patent replaces the traditional mechanical/direct transmission approach with a cryptographic system based on public-key infrastructure. The substitution involves using asymmetric encryption and shared secret computation to achieve secure communication without direct exposure of sensitive link information, transforming the security mechanism from straightforward transmission to cryptographic computation
2Ease of operation
If the second sub-headset monitors interactive information directly, then the monitoring function is straightforward, but the complexity of key management increases
Solution Approach 1:
The terminal is designed with multi-functionality, serving both as a communication mediator for key exchange and as a monitoring device that can observe interactive information between sub-headsets. This universal design consolidates multiple functions into a single device, reducing overall system complexity while maintaining monitoring capabilities
Solution Approach 2:
The patent employs the concept of copying cryptographic keys and secrets in a controlled manner. The terminal receives copies of public keys from sub-headsets and creates corresponding shared secrets through computation. This copying mechanism allows the terminal to monitor and manage key information without requiring direct complex key management between sub-headsets
Data Source
AI summary
A first wireless audio output device, a second wireless audio output device, and a Bluetooth device are provided. The first wireless audio output device is configured to: transmit monitoring instruction information to a second wireless audio output device through a first wireless link, the monitoring instruction information being configured to instruct to monitor interactive information between the first wireless audio output device and an audio source, the first wireless audio output device and the second wireless audio output device having a same public-private key pair; and transmit a public key of the public-private key pair to the audio source and receive a public key of the audio source through a second wireless link, enable the second wireless audio output device to snoop the public key of the audio source, and determine link information in the second wireless link.