Test Apparatus for Pre-Shared Key Integrity in Vehicle Networks
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Solution Overview
Problem
Electronic devices in moving objects, such as automobiles, face challenges in ensuring communication validity due to corruption of shared data like encryption keys, which can lead to incorrect control signals, necessitating an effective method for testing and validating these keys.
Innovation Solution
A test apparatus connected to electronic devices through a network, utilizing a generator to create third data from first and second data, and a determination unit to assess the correctness of the first data by restoring the second data, ensuring the pre-shared key's integrity by outputting error signals for abnormal keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption techniques are used to ensure communication validity, then communication security is improved, but the risk of data corruption in severe environments increases
Solution Approach 1:
The patent applies preliminary action by performing normality determination tests on shared data (encryption keys) before actual communication operations. The test apparatus pre-verifies the integrity of encryption keys stored in ECUs by having them compute test values and compare results, ensuring that corrupted keys are detected and replaced before being used for critical communication tasks, thus preventing data corruption from compromising communication validity
2Reliability
If shared data is stored in electronic devices for authentication, then communication security is improved, but the difficulty of detecting data corruption increases
Solution Approach 1:
The patent implements feedback by creating a closed-loop verification system where the test apparatus sends test inputs to ECUs, receives computed results, compares them with expected values, and feeds back normality determination. This feedback mechanism enables automatic detection of data corruption in authentication keys by continuously monitoring whether ECUs produce correct computations, making hidden corruption visible and actionable
3Reliability
If encryption keys are shared among ECUs for communication security, then authentication capability is improved, but the vulnerability to environmental corruption increases
Solution Approach 1:
The patent applies preliminary action by implementing normality determination tests that verify the integrity of shared encryption keys before they are used for authentication. The test apparatus pre-checks keys by having ECUs compute test values and comparing results, ensuring that only intact, uncorrupted keys are deployed for authentication, thus protecting against environmental corruption while maintaining authentication capability
Solution Approach 2:
The patent uses an intermediary approach by introducing a dedicated test apparatus that acts as a mediator between key distribution and authentication operations. This intermediary verifies key integrity through computed test values and normality determination, creating a protective layer that isolates authentication processes from environmental corruption risks while maintaining the shared key architecture
Data Source
AI summary
According to an embodiment, a test apparatus that is connected to an electronic device through a network includes a generator, a transmitter, and a determination unit. The generator generates third data computed from first data shared with the electronic device and predetermined second data. The transmitter transmits the third data to the electronic device. The determination unit determines whether the first data of the electronic device is normal depending on whether the second data is restored correctly from the third data using the first data of the electronic device.