Vehicle Key Issuance System with Validity-Based Update
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Solution Overview
Problem
Existing vehicle communication systems require mobile devices and onboard apparatuses to store multiple cryptographic keys, which can lead to resource constraints and increased communication frequency with the key issuing apparatus, compromising security and efficiency.
Innovation Solution
A vehicle communication system where the key issuing apparatus issues a single cryptographic communication key to both the mobile device and onboard apparatus, with validity information indicating when the key needs to be updated, reducing the frequency of communication and storage requirements, and enhancing security by preventing malicious manipulation of key validity information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cryptographic keys are stored in mobile device and onboard apparatus, then security of cryptographic communication is improved, but key storage resource increases and communication frequency with key issuing apparatus increases
Solution Approach 1:
The key issuing apparatus issues validity information along with the cryptographic key in advance, specifying when the key becomes invalid. This preliminary action allows the onboard apparatus to proactively request key updates before security compromises can occur, maintaining security without requiring multiple keys to be stored simultaneously.
Solution Approach 2:
The system changes the parameter of key validity over time by issuing validity information that specifies expiration dates or conditions. This allows a single key to be used securely for a limited period, after which it is automatically invalidated and replaced, reducing storage requirements while maintaining security through temporal limitation.
2Reliability
If multiple cryptographic keys are stored in mobile device and onboard apparatus, then security of cryptographic communication is improved, but communication frequency with key issuing apparatus increases
Solution Approach 1:
Validity information is issued in advance with the key, containing expiration dates or invalidation conditions. This allows the onboard apparatus to determine when key updates are needed based on pre-provided information, reducing unnecessary communication with the key issuing apparatus while maintaining security.
Solution Approach 2:
The onboard apparatus autonomously determines when to request key updates by checking the validity information it already possesses. This self-service mechanism reduces communication overhead by only contacting the key issuing apparatus when actually needed, rather than maintaining constant communication or storing multiple keys.
3Quantity of substance
If a single cryptographic key is stored in mobile device and onboard apparatus, then key storage resource decreases, but frequency of communication with key issuing apparatus must increase to maintain security
Solution Approach 1:
The key issuing apparatus provides validity information in advance that specifies when the single cryptographic key becomes invalid. This preliminary information allows the system to maintain security with a single key by knowing exactly when to replace it, eliminating the need for frequent communication while reducing storage requirements.
Data Source
AI summary
A vehicle communication system includes an onboard apparatus, a mobile device, and a key issuing apparatus provided outside the vehicle for issuing a key for cryptographic communication between the mobile device and the onboard apparatus. The mobile device and the onboard apparatus store the key, and perform the cryptographic communication using the key. The key issuing apparatus issues, to the onboard apparatus, the key and validity information indicating validity of the key. The onboard apparatus includes a determination section determining whether a validity ends, and an update request section transmitting a key update request to request the issuance of a new key. When the key update request has been received, the key issuing apparatus issues a new key to the mobile device, and issues a new key and validity information on the new key to the onboard apparatus.