In-Vehicle Message Authentication via Recency Information Embedding
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Solution Overview
Problem
Existing in-vehicle network communication systems, such as those using CAN, face challenges in efficiently detecting malicious messages without increasing the number of messages, particularly due to the need for separate messages containing MAC and control data.
Innovation Solution
An information processing device generates and manages recency information, which is embedded in communication messages to verify their authenticity, allowing for malicious message detection without increasing the message count by using encryption and verification rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message authentication using MAC is implemented by sending separate messages for MAC and control data, then authentication reliability is improved, but the number of messages increases
Solution Approach 1:
The patent combines the MAC and control data into a single integrated message structure. The receiving device extracts both the MAC and control data from this unified message, eliminating the need for separate message transmissions while maintaining authentication capability. This directly resolves the contradiction by merging two previously separate communication elements into one.
2Reliability
If separate messages are sent for MAC and control data, then message authentication capability is improved, but communication load increases
Solution Approach 1:
By merging MAC and control data into a single message, the patent reduces the total communication load. The receiving device processes one integrated message instead of two separate messages, thereby reducing energy consumption and communication overhead while preserving full authentication capability.
Data Source
AI summary
An information processing device that receives, from another information processing device, a communication message generated based on recency information and control data, includes: a recency information generation unit that generates the recency information; and a recency information management unit that extracts the recency information from the received communication message.