In-Vehicle Relay Authentication for Stable Function Unit Communication
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Solution Overview
Problem
Existing in-vehicle network systems lack effective security measures to handle new function units and varying communication environments, leading to potential security vulnerabilities.
Innovation Solution
A relay device and communication method that acquire and update authentication information for function units, perform authentication processes, and relay information based on authentication results, ensuring security even in challenging communication environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If authentication information is acquired from external devices and validity time limits are enforced, then security is improved, but communication stability deteriorates when vehicles move between different communication environments
Solution Approach 1:
The system performs preliminary authentication by acquiring authentication information from external devices before communication occurs. Authentication results are stored in advance with validity time limits, so when the vehicle enters a new communication environment, the pre-acquired authentication information can be immediately used without interruption, maintaining both security and communication stability.
2Reliability
If authentication information is updated frequently to maintain security, then security is improved, but loss of time increases due to repeated authentication processes
Solution Approach 1:
Instead of frequent updates, the system implements periodic authentication by setting validity time limits on authentication information. Within the validity period, the stored authentication result is reused without re-authentication. When the validity period expires, a new authentication is performed. This periodic approach balances security maintenance with time efficiency.
3Speed
If authentication information is stored locally in the vehicle, then communication speed is improved, but security deteriorates due to potential unauthorized access
Solution Approach 1:
The system uses an intermediary approach by acquiring authentication information from external authentication servers rather than storing it permanently in the vehicle. The authentication results are temporarily stored with validity time limits, acting as an intermediary between continuous external verification and local quick access. This maintains security through external verification while enabling fast communication within the validity period.
Data Source
AI summary
A relay device mounted to a vehicle includes a plurality of function units. The relay device includes: an authentication processing unit configured to acquire authentication information of a function unit from an external device outside the vehicle, and perform an authentication process regarding the function unit by using the acquired authentication information; and a relay processing unit configured to, on the basis of a result of the authentication process performed by the authentication processing unit, relay information between the function unit and another function unit. When a validity time limit of the authentication information has expired, the authentication processing unit acquires, from the external device, the authentication information that is new.