ECU Pairing via Backend Mediator for Secure Key Exchange
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Solution Overview
Problem
Modern automotive electronic control units (ECUs) face challenges in securing data communication due to limited computational power and memory, making it difficult to implement effective cryptographic protocols for authentication and key exchange, which can lead to vulnerabilities in pairing processes.
Innovation Solution
A computer-implemented method and system for mediating secure pairing between ECUs using session data, including a session identifier and a master session key, to protect communications, while also evaluating the security posture of each ECU during authentication and tracking pairings to prevent unauthorized copies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asymmetric key algorithms are used for authentication and key exchange between ECUs, then security is improved, but computational power and memory requirements are not met due to ECU constraints
Solution Approach 1:
A backend server is introduced as an intermediary to perform the computationally intensive asymmetric key operations. The ECU only needs to execute lightweight symmetric key operations after receiving session data from the backend server, which handles the complex authentication and key exchange processes centrally.
Solution Approach 2:
The computationally heavy asymmetric key algorithms are extracted from the ECU and relocated to the backend server. This allows the ECU to use simpler, more efficient symmetric key operations while the server handles the complex cryptographic tasks.
2Reliability
If cryptographic protocols are implemented to protect data communication between ECUs, then security is improved, but performance deteriorates due to limited computational resources
Solution Approach 1:
The backend server acts as a mediator that pre-computes session data including symmetric keys before ECU communication begins. This eliminates the need for ECUs to perform real-time asymmetric key operations during data communication, maintaining both security and performance.
Solution Approach 2:
The authentication and key exchange processes are performed in advance by the backend server before actual ECU communication occurs. Session data is prepared beforehand, allowing ECUs to communicate efficiently using pre-established symmetric keys without real-time computational overhead.
3Ease of operation
If pairing processes are simplified for resource-constrained ECUs, then ease of operation is improved, but security vulnerabilities increase due to insufficient authentication mechanisms
Solution Approach 1:
The backend server mediates the pairing process by handling complex authentication logic centrally. ECUs simply need to exchange pairing requests and receive session data, making the process easy to operate while the server ensures robust security through proper authentication and key management.
Solution Approach 2:
The backend server automatically performs authentication verification and session data generation without requiring complex ECU-side security implementations. The server serves itself by managing the security infrastructure, allowing ECUs to pair easily while maintaining strong security guarantees.
Data Source
AI summary
A computer-implemented system and method relate to establishing a secure pairing between a first electronic control unit (ECU), which is identifiable by a first identifier, and a second ECU, which is identifiable by a second identifier. A first pairing request is received from the first ECU to pair with the second ECU. The first pairing request includes the second identifier. Session data is generated. The session data includes at least a session identifier and a master session key. A first message is transmitted to the first ECU. The first message includes the session identifier and the master session key. A second pairing request is received from the second ECU to pair with the first ECU. The second pairing request includes the session identifier and the first identifier. A second message is transmitted to the second ECU. The second message includes at least the master session key.