Vehicle Certificate Security via Backend Time Validation
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Solution Overview
Problem
Existing vehicle-to-X communication systems are vulnerable to manipulation by unauthorized access, allowing future-valid certificates to be used for sending bogus messages, which is costly to mitigate with secure code and certificate memory.
Innovation Solution
Implementing a method where vehicles request and update certificates from a backend system before their validity period expires, using a tamper-proof communication link to validate system time and prevent external access, allowing for more frequent certificate updates and improved security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If certificates with long validity periods (2 years) are stored in vehicle memory, then the overall period with valid certificates is extended, but the risk of unauthorized access and bogus message transmission increases
Solution Approach 1:
The certificate validity management is made dynamic through periodic synchronization with the backend system. Instead of static long-term storage, the system dynamically updates certificates and validates time information at regular intervals, allowing the effective validity period to be extended while maintaining security through frequent refreshes and revocation checks.
Solution Approach 2:
The system implements feedback mechanisms by periodically communicating with the backend system to validate time information and certificate status. The backend system can revoke certificates or update time information, and the vehicle system responds by invalidating stored certificates, creating a closed-loop security mechanism that prevents unauthorized use of expired or compromised certificates.
2Reliability
If very secure code and certificate memory is provided to prevent unauthorized access, then information security is improved, but the cost increases significantly
Solution Approach 1:
The backend system acts as an intermediary that provides centralized security management. Instead of requiring each vehicle to have expensive secure hardware, the system uses a trusted external server to issue, revoke, and validate certificates. This shifts the security burden from distributed hardware security to centralized software-based certificate management.
Solution Approach 2:
The system uses short-lived certificates that are frequently updated and revoked. Rather than relying on expensive long-term secure storage, the approach uses inexpensive memory to store certificates with limited validity periods that are regularly refreshed through backend communication, making security more affordable.
3Reliability
If certificates are updated frequently with short validity periods, then information security is improved, but the complexity of certificate management increases
Solution Approach 1:
The vehicle system automatically manages certificate updates by periodically initiating synchronization with the backend system based on time intervals or event triggers. The system self-manages the complexity of frequent certificate updates by automating the refresh process, validation, and replacement without requiring manual intervention or complex external coordination.
Data Source
AI summary
A method for improving information security for vehicle-to-X communication, wherein the vehicle-to-X communication is protectable by at least one certificate, wherein the certificate for protecting the vehicle-to-X communication has a validity period of defined length and is provided for storage in a memory of a vehicle, wherein the method is additionally distinguished in that the vehicle uses a communication link for wireless data interchange between the vehicle and a backend system, before expiry of the validity period of the certificate and a change to a validity period of defined length for an updated certificate, to ask the backend system to provide an up-to-date piece of time information for the vehicle. In addition, the invention relates to a corresponding communication apparatus for vehicle-to-X communication.