Bluetooth Encryption Key Negotiation for Multi-Device Audio Security
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Solution Overview
Problem
Conventional Bluetooth audio technology is inadequate for supporting audio data transmission/reception between multiple devices due to limitations in one-to-one connections, power consumption issues, and weak encryption key sizes that compromise security.
Innovation Solution
A method and apparatus for configuring encryption key sizes in a wireless communication system by allowing a controller to provide information on encryption key sizes to a host, enabling secure and efficient audio data transmission between multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Bluetooth encryption key size (8-bit to 128-bit) is used, then device compatibility is maintained, but security is weakened
Solution Approach 1:
The patent implements dynamic encryption key size configuration where the controller and host negotiate and adjust the encryption key size based on security requirements and device capabilities. The system transitions from fixed conventional key sizes to a flexible, negotiable key size parameter that can be optimized for each connection scenario.
Solution Approach 2:
The patent changes the encryption key size parameter from fixed conventional values (8-bit to 128-bit) to a configurable parameter that can be set to 256-bit or other sizes. This parameter change is communicated through HCI commands between host and controller, allowing security strength to be adjusted without changing the fundamental encryption mechanism.
2Reliability
If encryption key size is increased to enhance security, then security is improved, but processing overhead and power consumption increase
Solution Approach 1:
The patent applies partial action by implementing encryption key size optimization where 256-bit keys are used selectively based on security requirements rather than universally. The system negotiates the appropriate key size for each connection, using stronger encryption only when necessary, thereby avoiding the excessive power consumption that would result from always using maximum encryption strength.
3Adaptability or versatility
If conventional one-to-one Bluetooth connections are used, then device simplicity is maintained, but support for multiple device audio transmission is inadequate
Solution Approach 1:
The patent implements multi-functionality in Bluetooth audio connections by enabling a single host to simultaneously maintain audio connections with multiple controllers. The encryption key configuration mechanism is extended to support multiple concurrent connections, allowing the system to function as both traditional one-to-one and modern many-to-many audio gateway configurations.
Data Source
AI summary
The present disclosure relates to a method, apparatus, and computer program for setting an encryption key in a wireless communication system; and a recording medium for same. According to one embodiment of the present disclosure, a method for setting an encryption key size in a wireless communication system may comprise: a step in which a first controller of a first device receives a first message containing information on a minimum value of a first encryption key size from a first host of the first device; and a step in which the first controller transmits, to the first host, a second message indicating an encryption change. The second message may contain information on the first encryption key size.