Bluetooth Advertising Mode Secure Key Exchange for Low Power
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Solution Overview
Problem
Existing Bluetooth communication methods for devices like TPMS sensors are vulnerable to malicious attacks due to non-secure data transmission, and the secure connected mode leads to high power consumption, making it unsuitable for low-power devices.
Innovation Solution
A Bluetooth communication method that enables secure message transmission between devices using security keys obtained and exchanged through a communication link established in Bluetooth advertising mode, reducing power consumption while ensuring data security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bluetooth connected mode is used for secure data transmission, then data security is improved, but power consumption increases
Solution Approach 1:
The patent segments the Bluetooth communication process into distinct phases: advertising mode for key exchange and connected mode for secure data transmission. This allows the low-power TPMS sensor to spend most time in advertising mode maintaining security keys, only transitioning to connected mode when actual data transmission is needed, thus resolving the contradiction between continuous security and low power consumption
Solution Approach 2:
The patent implements preliminary action by establishing security keys and communication links in advertising mode before actual data transmission occurs. The TPMS sensor pre-exchanges security information with the ECU during advertising mode, so when connected mode is activated for actual tire pressure data transmission, the security infrastructure is already in place, enabling secure transmission without requiring continuous high-power operation
2Use of energy by moving object
If Bluetooth advertising mode is used for data transmission, then power consumption is reduced, but data security deteriorates
Solution Approach 1:
The patent introduces security keys as an intermediary element that enables secure communication in advertising mode. These keys act as mediators between the TPMS sensor and ECU, allowing data to be transmitted securely during advertising mode without requiring full connected mode functionality, thus maintaining both low power consumption and data security
Solution Approach 2:
The patent changes the security parameters by implementing conditional encryption and authentication mechanisms that can operate in advertising mode. The system adjusts security parameters dynamically - using lighter security measures during advertising mode for key exchange, and stronger measures during connected mode for data transmission, resolving the contradiction between power consumption and security
3Reliability
If continuous secure transmission is implemented, then data security is maintained, but device complexity increases
Solution Approach 1:
The patent implements dynamic communication mode selection where the TPMS sensor can switch between advertising mode and connected mode based on transmission requirements. This dynamic approach allows the system to maintain security through advertising mode with simplified protocols, only activating the more complex connected mode when necessary, thus reducing overall device complexity while maintaining security
Data Source
AI summary
A Bluetooth communication method implemented between a first electronic device (101) and a second electronic device (102), the second electronic device (102) being capable of sending a secure message including data to be processed by the first electronic device (101). The method includes obtaining (20) at least one security key by each of the first and second electronic devices (101, 102); and transmitting (38) the secure message by the second electronic device (102) to the first electronic device (101) including establishing (44) a communication link in a Bluetooth advertising mode between these first and second devices (101, 102).