Digital Key Token Index Mapping for Immobilizer Revocation
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Solution Overview
Problem
Existing systems lack an efficient method for managing immobilizer tokens in digital key systems, particularly in transitioning from physical to digital keys, and do not effectively handle token revocation and storage optimization.
Innovation Solution
The proposed system generates and manages immobilizer token indices, maps digital keys to available indices, and transmits these indices for authorization, allowing for efficient token validation and revocation, thereby optimizing storage and authorization management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If immobilizer tokens are directly stored in digital key systems, then security is improved, but device complexity and storage requirements increase
Solution Approach 1:
The patent introduces an intermediary mapping relationship between digital keys and immobilizer tokens. Instead of directly storing tokens in the digital key system, it uses a mapping table that associates digital key identifiers with token indices. This intermediary layer reduces the complexity of the digital key system while maintaining security through the mapping relationship.
Solution Approach 2:
The patent extracts the immobilizer token storage and management functions from the digital key system itself. The actual tokens are stored separately in the vehicle's immobilizer system, while the digital key system only maintains mapping information. This extraction reduces the burden on the digital key device and simplifies its structure.
2Adaptability or versatility
If multiple immobilizer tokens are stored for different digital keys, then authorization flexibility is improved, but storage space is consumed
Solution Approach 1:
The patent uses indexing as a form of copying. Instead of storing complete immobilizer tokens for each digital key, it stores compact index values that reference the actual tokens. This copying approach maintains authorization flexibility by allowing multiple digital keys to reference different tokens while consuming minimal storage space in the digital key system.
Solution Approach 2:
The patent segments the storage requirement into two parts: the digital key system stores only index mappings (small data), while the vehicle system stores the actual immobilizer tokens (large data). This segmentation allows multiple digital keys to be supported with flexible authorization while optimizing storage distribution across different systems.
3Ease of operation
If immobilizer token management is integrated into digital key system, then ease of operation is improved, but difficulty of detecting and measuring token status increases
Solution Approach 1:
The patent introduces an intermediary mapping layer that simplifies token status detection. By using index values as intermediaries, the system can easily track token status through the mapping table without directly examining the complex immobilizer token data structures. This intermediary approach makes token status tracking more straightforward while maintaining ease of operation for users.
Data Source
AI summary
The present disclosure relates to an immobilizer token management system, and an embodiment may include generating immobilizer token indices, generating a digital key according to a request for the issuance of a digital key received from a digital key sharing device, mapping the digital key to one of the immobilizer token indices, and transmitting, to the digital key sharing device, the digital key and the immobilizer token index mapped to the digital key.