Vehicle Digital Key Verification Using Selective Attestation
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Solution Overview
Problem
The existing methods for authenticating digital keys for vehicles require a large amount of data transmission, especially during the first-time authentication, which can be time-consuming and inconvenient, particularly when using NFC communication.
Innovation Solution
The proposed solution involves an apparatus that determines a sequence of key identifiers for a corresponding sequence of digital keys used to derive the target key. This apparatus efficiently identifies the first unverified key in the sequence and obtains an attestation for it, allowing for incremental verification of the target key without the need to transmit all attestations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all digital keys and attestations are transmitted during first-time authentication, then the authentication is complete and reliable, but the data transmission volume is large and the process is time-consuming
Solution Approach 1:
The authentication process is segmented into multiple stages: first transmitting only key identifiers (not full keys), then transmitting attestations selectively for unverified keys. This divides the large data transmission task into smaller, manageable segments that are transmitted only when necessary.
Solution Approach 2:
Key identifiers are transmitted preliminarily before the full digital keys and attestations. This preliminary action allows the vehicle to identify which keys need verification without receiving all authentication data upfront, enabling selective transmission of only necessary attestations.
2Reliability
If all digital keys and attestations are transmitted during first-time authentication, then the authentication is complete and reliable, but the data transmission volume is large
Solution Approach 1:
The method extracts and transmits only the essential key identifiers first, separating them from the full digital keys and attestations. This extraction allows the system to determine exactly what additional data (attestations) is needed, minimizing the total data volume transmitted while maintaining authentication reliability.
Solution Approach 2:
Authentication data is segmented into three components: key identifiers (transmitted first), digital keys (stored in vehicle), and attestations (transmitted selectively). This segmentation enables the system to transmit minimal data (only identifiers and selective attestations) rather than all authentication data at once.
3Ease of operation
If NFC communication is used for authentication, then wireless communication is enabled, but the large data transmission required for authentication increases energy consumption
Solution Approach 1:
The method extracts and transmits only key identifiers via NFC instead of all authentication data. This extraction dramatically reduces the data volume transmitted through the energy-intensive NFC channel, thereby reducing energy consumption while maintaining authentication functionality.
Solution Approach 2:
Instead of transmitting all necessary authentication data in one complete action, the method uses partial action by transmitting only key identifiers first, then using those identifiers to determine which attestations need to be transmitted, potentially reducing the total data transmitted through NFC.
Data Source
AI summary
An apparatus for checking a digital target key of a device for a vehicle determines a sequence of key identifiers for a corresponding sequence of digital keys that have been used to derive the target key, and identifies the first key identifier in the sequence for a corresponding first key in the sequence of keys that has not yet been verified for the vehicle. The apparatus also obtains an attestation for the identified key from the device to verify the identified key on the basis of the obtained attestation, and to check the target key of the device on the basis of the verified identified key.