Vehicle Central Unit Dynamic Encryption for Key Security
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Solution Overview
Problem
The increasing automation and computerization of vehicles have made them vulnerable to cyberattacks and data interception by malicious third parties, with existing solutions like signal scrambling and encryption being insufficient to prevent unauthorized access.
Innovation Solution
A method and system for secure management of vehicle devices using a central unit and folding keys that exchange data via an encrypted channel, generating unique data sets each time, and deleting authorization data for used folding keys to prevent future activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption algorithm is used to protect vehicle data, then security against interception is improved, but complexity of the system increases and may still be vulnerable to sophisticated attacks
Solution Approach 1:
The patent implements dynamic encryption where the encryption key changes with each communication session. The central unit generates a new random key for each interaction with a folding key, ensuring that even if one session is compromised, previous and future sessions remain secure. This dynamic approach enhances security without requiring overly complex static encryption systems.
Solution Approach 2:
The patent employs preliminary key generation and distribution mechanisms. The central unit pre-generates encryption keys and securely distributes them to folding keys before communication begins. This preliminary setup enables secure communication without requiring complex real-time key negotiation during actual data transmission.
2Ease of operation
If authorization data is retained in central unit for folding keys, then ease of operation is improved, but security is worsened as intercepted data can be reused for future interactions
Solution Approach 1:
The patent implements a one-time use authorization mechanism where the central unit deletes the authorization data for a folding key after a successful interaction. This ensures that even if data is intercepted during transmission, it cannot be reused for future interactions since the authorization has been discarded. The system recovers security by generating new authorization data for subsequent interactions.
Solution Approach 2:
The patent treats authorization data as disposable, short-lived security credentials. Each authorization token is designed to be used once and then discarded, preventing replay attacks. This approach maintains ease of operation by allowing multiple folding keys to be stored, while enhancing security by ensuring each authorization is single-use only.
3Ease of manufacture
If signal scrambling is used to protect vehicle communication, then implementation simplicity is improved, but real security protection is lost as the signal remains predictable to receivers
Solution Approach 1:
The patent replaces simple signal scrambling (mechanical/electrical transformation) with cryptographic encryption (mathematical transformation). Instead of merely altering the signal form, the system uses encryption algorithms to transform data into secure ciphertext that cannot be reverse-engineered without the proper key, providing real security while maintaining implementation feasibility through standardized cryptographic protocols.
Data Source
AI summary
There are disclosed methods and a system for safe management of various devices of a vehicle. These are car alarm system, immobilizer, central lock, etc. The method can be used in on-board computer of car and in various separate devices managing other devices in car. The method is applicable as a safety measure for all situations where safe management of devices is required, for example, managing the premises security. A central unit and folding key exchanges data via an encrypted channel. Each time the folding key and central unit interchange data, there is formed unique data set so even if the malicious third party intercepts data they will not be able to use it for future interactions.