Electronic Device P2P Key Transfer for Encrypted Audio
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Solution Overview
Problem
Existing electronic devices face challenges in securely transmitting encrypted audio signals to external audio devices like headsets without direct input mechanisms and when connected via Bluetooth to a terminal device, leading to difficulties in requesting encryption keys.
Innovation Solution
The electronic device employs a communication interface to broadcast identification information and transmit encrypted audio signals using BLE, establish P2P communication with a terminal device, and securely transmit encryption keys to decrypt audio signals via the terminal device to the audio device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the external device (headset) is already connected to a terminal device via Bluetooth, then the terminal device can communicate with the headset, but the TV cannot connect to the external device via Bluetooth communication
Solution Approach 1:
The patent introduces a terminal device as an intermediary to facilitate communication between the TV and the external audio device. The terminal device acts as a mediator that receives the encrypted audio signal from the TV and forwards it to the external device, enabling indirect communication when direct Bluetooth connection is unavailable.
Solution Approach 2:
The communication path is segmented into multiple stages: TV to terminal device communication for key exchange, and terminal device to external device communication for audio transmission. This segmentation allows each component to perform its specific function independently, resolving the connectivity conflict.
2Ease of operation
If there is no input portion for manipulation in the external device (headset), then the device is easy to use, but it is difficult to request the encryption key through the external device
Solution Approach 1:
The external audio device autonomously generates and transmits the encryption key request without requiring user input. The device automatically establishes communication with the terminal device, requests the encryption key, and completes the authentication process independently, maintaining simplicity while enabling complex cryptographic operations.
3Productivity
If the TV transmits the encryption key directly to the audio device, then the key transmission is straightforward, but security is compromised when direct connection is not available
Solution Approach 1:
The terminal device serves as a secure intermediary for encryption key transmission. The TV transmits the encryption key to the terminal device over a trusted connection, and the terminal device forwards it to the external audio device. This intermediary approach maintains security by ensuring the key passes through a controlled channel even when direct TV-to-device transmission is not possible.
Solution Approach 2:
The encryption key is transmitted and stored in the terminal device before the actual audio playback occurs. This preliminary key transmission ensures that when the audio stream needs to be decrypted, the key is already available in the terminal device, maintaining both security and efficiency without requiring real-time key exchange during playback.
Data Source
AI summary
An electronic device includes a communication interface; one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the electronic device to broadcast an advertising packet including identification information of the electronic device and a Wi-Fi MAC address; transmit an encrypted audio signal, to the audio device; based on receiving a request for Point-to-Point (P2P) from the terminal device, perform the P2P communication with the terminal device based on the Wi-Fi MAC address; and based on identifying a preset event has occurred for enabling transmission of an encryption key of the electronic device, transmit the encryption key to the terminal device by using the P2P communication, to cause the terminal device to transmit the encryption key to the audio device and to cause the audio device to decrypt the encrypted audio signal based on receiving the encryption key.