Group Key Generation for Multi-Device Zero-Power Communication
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Solution Overview
Problem
Existing non-contact data transmission systems with zero-power devices lack efficient and secure methods for sharing secret information among multiple devices, as existing solutions only consider security between a single zero-power device and a target device.
Innovation Solution
A method involving a first device sending multiple messages to multiple second devices, each occupying different time domains, for key generation, and exchanging messages to determine a group key, ensuring secure and efficient information sharing among the devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pairwise key is used for data transmission between a zero-power device and a target device, then security is ensured, but efficiency of sharing secret information among multiple devices deteriorates
Solution Approach 1:
The patent segments the key management system into two distinct key types: pairwise keys for individual device communication and a group key for multi-device secret sharing. This segmentation allows each key type to serve its specific function optimally, resolving the contradiction between security and efficiency in multi-device scenarios
Solution Approach 2:
The patent introduces a group key as an intermediary that enables efficient secret sharing among multiple zero-power devices. The group key acts as a mediator that allows devices to share secrets without requiring multiple pairwise key exchanges, thereby improving efficiency while maintaining security through the established key hierarchy
2Reliability
If pairwise keys are established between target device and multiple zero-power devices, then security is ensured, but complexity of key management increases
Solution Approach 1:
The patent divides the key management complexity into two manageable segments: pairwise keys for individual device authentication and a group key for collective secret sharing. This segmentation simplifies the overall key management structure compared to establishing and maintaining multiple pairwise keys for all device combinations
Solution Approach 2:
The group key serves multiple functions simultaneously: it enables secret sharing among all group members, provides a basis for group authentication, and reduces the number of key management operations needed. This multi-functionality reduces key management complexity while maintaining security
3Reliability
If multiple messages are exchanged for key generation, then security of key establishment is improved, but time consumption increases
Solution Approach 1:
The patent performs preliminary key generation actions by establishing pairwise keys and generating the group key in advance through structured message exchanges. This preliminary action ensures security is built into the key establishment process before actual data transmission begins, reducing time consumption during operational phases
Data Source
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AI summary
The present disclosure relates to a key generation method, a device, a computer-readable storage medium, a computer program product, and a computer program. The method includes the following. A first device sends multiple first messages to multiple second devices, where a different first message among the multiple first messages occupies a different time domain range, and the multiple first messages are used for the multiple second devices to generate keys. The first device receives multiple second messages sent by the multiple second devices, where a different second message among the multiple second messages is related to a key of a different second device. The first device sends multiple third messages to the multiple second devices, where a different third message among the multiple third messages is used for a different second device to determine a group key.