Vehicle Digital Key Relay for Secure Offline Access Transfer
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Solution Overview
Problem
Existing digital vehicle key systems face challenges in securely transferring additional information from an external entity to a motor vehicle, especially when a direct connection between the external entity and the vehicle is disrupted, such as during key exchange from an owner to a friend.
Innovation Solution
A method involving a tracking service that encrypts and transmits additional information to the motor vehicle through a friend device, using nested encryption with public and private cryptographic keys, allowing secure delivery even without a direct connection between the external entity and the motor vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional information is transmitted directly from the external entity to the motor vehicle, then the transfer is simple and direct, but the connection may be disrupted and security is compromised
Solution Approach 1:
The friend device serves as an intermediary between the external entity and the motor vehicle. The external entity transmits additional information to the friend device, which then forwards it to the motor vehicle. This mediator approach ensures that the information reaches the vehicle securely even when direct connection is disrupted, as the friend device already possesses the information from the tracking service response.
Solution Approach 2:
The additional information is transmitted to the friend device in advance during the key creation process, before the friend device needs to access the motor vehicle. This preliminary action ensures that when the friend attempts to use the vehicle, the information is already available at the friend device and can be forwarded immediately without requiring a new direct connection to the external entity.
2Ease of operation
If direct communication is established between the external entity and the motor vehicle, then information transfer is straightforward, but it fails when wireless connection is disrupted
Solution Approach 1:
The friend device acts as a reliable intermediary that bridges the external entity and the motor vehicle. When the friend creates a key, they receive additional information from the tracking service. This information is then transmitted to the motor vehicle by the friend device, ensuring the process works even when the friend's wireless connection to the external entity is disrupted at the time of vehicle access.
Solution Approach 2:
The system performs preliminary action by obtaining and storing additional information at the friend device during the key creation phase. This ensures that when the friend needs to access the vehicle later, the information is already cached at the friend device, eliminating the need for real-time connection to the external entity during vehicle access.
3Loss of time
If additional information is transmitted before key creation, then the vehicle has information ready, but the key exchange security is compromised
Solution Approach 1:
The system performs preliminary action by obtaining additional information from the external entity during the key creation process, before the friend device uses the key to access the vehicle. This timing ensures the information is ready when needed without compromising security, as the information is transmitted through the secure key exchange protocol between the friend device and the motor vehicle.
Solution Approach 2:
The tracking service provides feedback to the friend device during key creation, including the additional information in the tracking response. This feedback mechanism ensures that the information is obtained at the appropriate time (during key creation) and then securely transmitted to the vehicle by the friend device, balancing early availability with security requirements.
Data Source
AI summary
A method for controlling access to a motor vehicle includes steps of creating a digital key for access to the motor vehicle on the part of a friend device; signing the created key by an owner device of the motor vehicle; transmitting a tracking request for the signed key to a tracking service; transmitting a tracking response from the tracking service to the friend device; wherein the tracking response comprises encrypted information of the tracking service; and presenting the encrypted information to the motor vehicle by the friend device. In this case, the tracking response comprises additional information that the tracking service has obtained from a manufacturer service in relation to the tracking request.