Diagnostic Relay Authentication for Lower Bus Processing Load
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Solution Overview
Problem
Existing communication systems face increased processing loads due to unauthorized access prevention techniques using common keys and message authentication codes, which can be abused and lead to illegal data transmission.
Innovation Solution
A communication system with a relay device that determines the legitimacy of data from a diagnostic tool based on inquiry signals from diagnosis target devices, reducing processing loads by monitoring and managing data authenticity through a relay device and diagnosis target device collaboration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common key and message authentication code are used to prevent unauthorized access, then data security is improved, but processing load on each device increases
Solution Approach 1:
The relay device serves as an intermediary between the diagnostic tool and diagnosis target devices. It performs the authentication and legitimacy determination centrally, receiving data from the diagnostic tool and verifying its legitimacy before forwarding to target devices. This mediator approach transfers the processing burden from multiple target devices to a single relay device, reducing overall system processing load while maintaining security
Solution Approach 2:
Instead of requiring every diagnosis target device to perform full authentication verification, the system implements partial action where only the relay device performs legitimacy determination. The target devices receive pre-verified data with reduced verification overhead, achieving adequate security through selective rather than universal processing
2Reliability
If continuous monitoring of all data is performed to detect spoofed data, then data authenticity is improved, but processing load and time consumption increase
Solution Approach 1:
The relay device performs legitimacy determination in advance before data reaches the diagnosis target devices. By pre-verifying the authenticity of data from the diagnostic tool, the system eliminates the need for time-consuming verification at each target device, reducing overall time consumption while maintaining authenticity detection capability
Solution Approach 2:
The relay device provides feedback to diagnosis target devices about the legitimacy status of received data. This feedback mechanism allows target devices to quickly identify and handle spoofed data without performing extensive verification themselves, reducing time consumption while improving data authenticity assurance
Data Source
AI summary
A communication system includes a relay device and a diagnosis target device. The relay device includes a port configured to connect a diagnostic tool. The diagnosis target device is connected to the relay device via a bus. When the diagnosis target device has received specific data whose source appears to be the diagnostic tool, the diagnosis target device sends an inquiry signal for inquiring of the relay device about a monitoring result for the specific data. The relay device determines in response to the inquiry signal whether the specific data is legitimate data from the diagnostic tool. The relay device sends the monitoring result including a determination result to the diagnosis target device.