ECU Provisioning via Unique Security Key Signatures
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Solution Overview
Problem
The integration of new electronic control units (ECUs) into vehicles is complex due to compatibility issues, malfunctions, and security concerns, including difficulty in registering ECUs to specific vehicles and protecting against malicious access, leading to increased engineering effort and costs.
Innovation Solution
A system where ECUs send provisioning messages with unique security keys to a remote server for validation and association with a vehicle identifier, enabling secure communication and registration, and allowing for dynamic addition and compatibility checks of ECUs across various manufacturers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ECUs are manually registered and secured with individual key certificates, then security against malicious access is improved, but device complexity and engineering effort increase significantly
Solution Approach 1:
The ECU automatically performs provisioning by sending a provisioning message with its unique security key signature to the remote server, which automatically validates the signature and establishes the ECU-vehicle association. This self-service mechanism eliminates manual registration while maintaining security through cryptographic verification.
Solution Approach 2:
The system pre-distributes unique security keys to ECUs before deployment. When an ECU connects to the vehicle communication system, it already possesses the cryptographic credentials needed for automatic authentication and provisioning, enabling seamless secure integration without manual intervention.
2Measurement precision
If ECUs are manually registered to specific vehicles during assembly, then ECU-vehicle association accuracy is improved, but productivity decreases due to time-consuming manual processes
Solution Approach 1:
The ECU autonomously identifies itself to the remote server by signing a provisioning message with its unique security key. The server automatically validates the signature and binds the ECU to the vehicle identifier, achieving precise association without manual intervention and enabling rapid scaling of vehicle assembly operations.
Solution Approach 2:
The manual mechanical process of ECU registration is replaced with an automated electronic cryptographic verification system. The unique security key signature mechanism substitutes human operators, enabling high-speed automated provisioning while maintaining precise ECU-vehicle matching.
3Reliability
If secure key certificates are implemented for each ECU, then protection against intruders is improved, but manufacturing cost increases due to key management complexity
Solution Approach 1:
The ECU automatically proves its authenticity by signing the provisioning message with its unique security key. The remote server validates this self-generated signature to confirm the ECU's identity and establish secure communication, eliminating the need for complex manual key distribution and reducing manufacturing costs.
Solution Approach 2:
The remote server acts as a trusted intermediary that validates ECU identities through cryptographic signature verification. This centralized validation mechanism simplifies the overall system architecture and reduces the burden on individual ECUs and manufacturing processes while maintaining strong security.
4Adaptability or versatility
If replacement ECUs use the same security provisioning process, then interoperability with vehicle systems is improved, but device complexity increases due to re-provisioning requirements
Solution Approach 1:
The same automatic provisioning mechanism works for both original and replacement ECUs. When a replacement ECU is installed, it automatically sends a provisioning message with its unique security key signature, and the remote server validates it and associates it with the vehicle identifier, ensuring interoperability without requiring different processes.
Solution Approach 2:
Replacement ECUs are pre-configured with unique security keys before installation. Upon connection to the vehicle communication system, they automatically initiate the provisioning process, eliminating the need for manual re-provisioning and simplifying the replacement workflow while maintaining security and interoperability.
Data Source
AI summary
A system includes an electronic control unit (ECU) including a processor that determines that the ECU has been communicably connected to a vehicle communication system. The processor sends a provisioning message, via the communication system, to a remote server, responsive to connection to the vehicle communication system. The message includes a vehicle identifier provided by an element of the vehicle system and signed with a unique security key specific to the ECU. The processor is also receives a confirmation response from the remote server and enables further communication for the ECU responsive to the confirmation response.