Electronic Key Registration via Unique Encryption Logic
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Solution Overview
Problem
Existing electronic key registration systems face challenges in securely registering and verifying electronic keys with controllers, allowing unauthorized keys to be registered and lacking flexibility for additional key registration or replacement scenarios.
Innovation Solution
The system generates and stores unique encryption keys for each electronic key using specific encryption key generation logic, ensuring that only keys with the correct identification information can be registered and verified, allowing for easy registration while maintaining security through additional key production and registration steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller and electronic key are shipped together with pre-registered encryption keys, then security is ensured through factory registration, but the process becomes complicated and additional key registration is not possible
Solution Approach 1:
The controller is pre-configured with identification information (vehicle ID) during factory production, and the electronic key is pre-configured with encryption key generation codes. This preliminary setup enables secure communication while allowing flexible additional registration later through the main body device, resolving the contradiction between security and operational flexibility.
2Adaptability or versatility
If the vehicle ID is tampered with, then the controller would accept unauthentic electronic keys, but preventing tampering adds complexity to the system
Solution Approach 1:
The main body device serves as an intermediary that manages the registration process. It verifies the identification information in the controller and the encryption key generation code in the electronic key, then facilitates the registration of additional keys. This intermediary approach enables flexible key management without requiring complex tamper prevention mechanisms in the controller itself.
3Reliability
If encrypted communication is used between electronic key and controller, then confidentiality is ensured, but the registration process becomes more complex
Solution Approach 1:
The electronic key contains encryption key generation codes that enable it to self-generate the appropriate encryption keys for confidential communication. The main body device facilitates this self-service process by verifying the key generation code and registering the generated encryption key in the controller, thereby ensuring confidentiality while simplifying the overall registration process.
Data Source
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AI summary
This electronic-key registration method, in which a plurality of electronic keys (2) including an initially registered first electronic key and a second electronic key to be registered additionally are registered with a control device (6) for a communication target, is provided with the following steps: an additional-key manufacturing step in which an additional-encryption-key generation code (SC-9) unique to the second electronic key and an additional encryption key (K-9) used in authentication of the second electronic key are stored in the second electronic key; and an additional-key registration step in which, if identifying information (VID-A) unique to the communication target is stored in the second electronic key, the additional-encryption-key generation code (SC-9) is obtained from the second electronic key, an additional encryption key (K-9) is generated by additional-encryption-key generation logic (g) using the additional-encryption-key generation code (SC-9) and the aforementioned identifying information (VID-A), and said additional encryption key is stored in the control device (6).