Vehicle Controller Symmetric Key Update Protocol
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Solution Overview
Problem
Existing vehicle communication networks face security risks due to the potential leakage of encryption keys, which can lead to malfunctions and exposure of important information, especially in autonomous vehicles where hacking can endanger lives and compromise information security.
Innovation Solution
A control method for vehicles that utilizes a first and second controller to generate and update symmetric keys through encryption and decryption processes, ensuring the security of the vehicle communication network by periodically updating and synchronizing the keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encryption key is used to maintain security of messages transmitted and received, then security of vehicle communication is improved, but the likelihood of key leakage and potential malfunction increases due to network accessibility
Solution Approach 1:
The patent implements dynamic key management by periodically updating encryption keys between controllers. Instead of using a static key, the system dynamically generates and updates keys through a key update protocol, making the security system adaptive and resilient to potential key leakage risks in networked vehicle environments.
Solution Approach 2:
The patent employs periodic key update mechanisms where encryption keys are renewed at predetermined intervals or after a specific number of communication sessions. This periodic action ensures that even if a key is compromised, the window of vulnerability is limited, and security is continuously refreshed.
2Reliability
If encryption keys are frequently updated to prevent leakage, then security is enhanced, but communication complexity and processing overhead increase
Solution Approach 1:
The patent enables controllers to autonomously perform key updates through a self-service mechanism. Each controller can independently initiate and complete key update protocols with its communication partners, reducing the need for centralized key management infrastructure and simplifying the overall system architecture while maintaining high security standards.
Solution Approach 2:
The patent introduces a key update protocol as an intermediary mechanism that facilitates secure key exchange between controllers. This protocol acts as a standardized mediator that simplifies the complex cryptographic operations by providing a predefined sequence of actions, making key management more manageable despite the frequent updates required.
3Productivity
If symmetric keys are shared between controllers for efficient communication, then communication efficiency is improved, but the risk of key exposure and unauthorized access increases
Solution Approach 1:
The patent transforms the static symmetric key sharing model into a dynamic one where keys are continuously updated. Controllers maintain efficient symmetric key communication but periodically refresh these keys through automated update protocols, ensuring that the efficiency benefit is maintained while the exposure risk is continuously mitigated through key rotation.
Data Source
AI summary
A control method of a vehicle by a first controller and a second controller, the control method includes: generating, by the first controller, an Ea(B) in which a second symmetric key is encrypted based on a first symmetric key, and assigning a first random number to the Ea(B); receiving, by the second controller, the Ea(B) and the first random number, generating a fourth symmetric key in which the Ea(B) is decrypted based on a third symmetric key, and generating an Eb(N(MASTER)) in which the first random number is encrypted based on the fourth symmetric key; receiving, by the first controller, the Eb(N(MASTER)), and decrypting the Eb(N(MASTER)) to generate a second random number; and updating the second symmetric key based on a comparison between the first random number and the second random number.