In-Vehicle Network Message Timing Against Reference Signals
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Solution Overview
Problem
Current technologies for detecting unauthorized messages in in-vehicle networks lack accuracy, leading to potential misidentification of authorized and unauthorized messages.
Innovation Solution
A detection device and method that monitors authorized and unauthorized messages, calculates time differences between their transmission times, and uses these differences to accurately identify unauthorized messages, avoiding erroneous detection by referencing the transmission time of a periodically transmitted reference message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current detection technologies are used to identify unauthorized messages, then detection can be performed, but accuracy is insufficient leading to misidentification of authorized and unauthorized messages
Solution Approach 1:
The system performs preliminary registration of authorized messages during a learning phase before actual detection begins. The message registration unit stores transmission times and identifiers of authorized messages in advance, creating a reference database that enables accurate subsequent detection without misidentification
Solution Approach 2:
The invention introduces a message registration unit as an intermediary between message transmission and detection. This unit captures and stores message characteristics (transmission times, identifiers) during a learning period, serving as a mediator that provides accurate reference data for the detection unit to compare against incoming messages
2Measurement precision
If detection is performed without reference to transmission time differences, then detection process is simpler, but accuracy of identifying unauthorized messages decreases
Solution Approach 1:
The invention adds the time dimension to message detection by comparing transmission times of authorized messages with incoming messages. The detection unit calculates time differences and uses this temporal information as an additional criterion for identifying unauthorized messages, moving beyond simple identifier matching
Solution Approach 2:
The system pre-registers message transmission times and patterns during a learning phase before detection begins. This preliminary capture of temporal characteristics enables the detection unit to use time differences as a reliable indicator for identifying unauthorized messages without requiring complex real-time analysis
3Adaptability or versatility
If fixed detection criteria are used, then detection process is more straightforward, but flexibility to adapt to various transmission cycles is reduced
Solution Approach 1:
The system dynamically adapts detection criteria based on the specific message type and transmission pattern being monitored. The detection unit adjusts time difference thresholds and comparison parameters according to the registered characteristics of each message type, enabling flexible adaptation to various transmission cycles without fixed rigid criteria
Solution Approach 2:
The invention changes detection parameters (time thresholds, comparison criteria) based on the specific message type and transmission cycle being monitored. The system registers and adapts to different transmission patterns, adjusting detection parameters dynamically to maintain effectiveness across various communication scenarios
Data Source
AI summary
An unauthorized message in an in-vehicle network is more accurately detected. A detection device includes: a monitoring unit configured to monitor, as target messages, an authorized message being periodically transmitted and the unauthorized message in the in-vehicle network, and monitor a reference message being periodically transmitted; a calculation unit configured to, based on a monitoring result of the monitoring unit, calculate a time difference between a time corresponding to a transmission time of the target message and a time corresponding to a transmission time of the reference message; and a detection unit configured to, based on the time difference calculated by the calculation unit, perform a detection process of detecting the unauthorized message.