Vehicle Control Unit Update Authentication Against Unauthorized Firmware
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Solution Overview
Problem
Conventional vehicle control systems, both human-operated and autonomous, face challenges with secure firmware and software updates, as they can be susceptible to unauthorized or improperly configured changes, leading to potential vehicle malfunctions or safety hazards due to lack of control by manufacturers once the vehicles leave their possession.
Innovation Solution
A secure vehicle control unit update system that utilizes a private key associated with a vehicle's identification number, stored in a memory resource, to authenticate and authorize updates, ensuring only authorized changes are made by comparing the stored private key with the key included in the update data, and using message authentication codes to prevent man-in-the-middle attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If firmware and software updates are allowed to improve vehicle performance, then vehicle functionality and safety can be enhanced, but the system becomes vulnerable to unauthorized or malicious updates that may cause malfunctions or safety hazards
Solution Approach 1:
The system performs preliminary authentication of update packages before allowing installation. A cryptographic signature is verified against a stored public key, and a message authentication code (MAC) is computed and verified using a secret key. This preliminary verification ensures that only authorized updates from the manufacturer can be installed, preventing unauthorized modifications while allowing legitimate performance improvements.
Solution Approach 2:
The patent introduces cryptographic authentication mechanisms as an intermediary between the update source and the control unit. The manufacturer signs updates with a private key, and the vehicle verifies these signatures using a public key. Additionally, a MAC computed with a secret key serves as a second layer of authentication. This intermediary verification process ensures that updates are genuine and authorized without requiring direct trust in the transmission channel.
2Adaptability or versatility
If control components and sensors are used to enable autonomous vehicle operation, then driver limitations are overcome, but the system becomes dependent on components that may fail or require updates that compromise safety
Solution Approach 1:
The system implements a feedback mechanism where the control unit continuously verifies the authenticity of firmware and software updates before applying them. The authentication process provides feedback on whether an update is authorized, preventing the installation of potentially harmful updates. This feedback loop ensures that autonomous operation capabilities are maintained only when backed by verified, safe software, thereby reducing component failure risk while preserving adaptability.
3Object-affected harmful factors
If private key authentication is implemented to secure updates, then unauthorized modifications are prevented, but the system complexity increases due to cryptographic operations
Solution Approach 1:
The authentication system is segmented into two distinct layers: a public key infrastructure layer for verifying the authenticity of update packages, and a message authentication code layer for ensuring integrity during transmission. This segmentation allows each cryptographic mechanism to perform its specific function efficiently, preventing unauthorized modifications while managing complexity through modular design where each layer can be implemented and verified independently.
Data Source
AI summary
The present disclosure includes apparatuses and methods related to a secure vehicle control unit update. An example apparatus comprises a processing resource coupled to a memory resource. The memory resource can be configured to store a private key associated with a vehicle and store data corresponding to an update to a control unit of the vehicle. The processing resource can be configured to compare the private key associated with the vehicle and a private key included in the data corresponding to the update to the control unit that is stored in the memory resource and allow transmission of the update to the control unit of the vehicle in response to the private key associated with the vehicle matching the private key included in the data.