Vehicle-to-Vehicle Data Verification With Hash-Based Relay Sharing

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Solution Overview

Problem

In vehicle-to-vehicle communication systems, non-representative nodes cannot ensure the legitimacy of data received from a representative node, and reducing server communication data transmission is necessary.

Innovation Solution

A communication system where data is divided into multiple parts and transmitted to different groups of vehicles, with each vehicle verifying the legitimacy of received data using hash values included in management information, ensuring data integrity through vehicle-to-vehicle communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If data is transmitted from the management server to all vehicles, then all vehicles can receive the data, but the amount of communication data from the server increases

Engineering Contradiction:

Improvedata legitimacyVSAvoidcommunication data amount

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments the communication system into three groups: vehicles that receive data directly from the server, vehicles that receive data from other vehicles, and the server itself. This segmentation allows the server to transmit data to only one representative vehicle in each group, significantly reducing the total communication data amount while ensuring all vehicles eventually receive the data through vehicle-to-vehicle communication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces management information as an intermediary that contains verification data (hash values) generated by the server. This management information is transmitted to all vehicles along with the actual data, enabling vehicles to verify the legitimacy of received data without requiring direct communication with the server, thus reducing server communication load while maintaining data legitimacy.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If non-representative nodes receive data from the representative node, then communication load on the server is reduced, but the legitimacy of the data cannot be ensured

Engineering Contradiction:

Improvecommunication data amountVSAvoiddata legitimacy

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The server performs preliminary actions by generating management information containing hash values of the data before transmitting the data to vehicles. This management information is sent in advance to all vehicles, enabling them to verify data legitimacy independently when receiving data from other vehicles, thus ensuring data legitimacy while reducing server communication load.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where vehicles use the management information (hash values) to verify the legitimacy of received data. This verification process provides feedback on data integrity, allowing vehicles to confirm whether received data matches the original data generated by the server, thereby ensuring data legitimacy in the reduced communication model.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20260006415A1Communication system, communication method, and vehicle that uses vehicle-to-vehicle communication

Publication Date: 2026.01.01 PANASONIC AUTOMOTIVE SYST CO LTD

AI summary

A server stores data including first data and second data, first information for verifying legitimacy of the first data, and second information for verifying legitimacy of the second data. The server transmits management information and the first data to the first vehicle and transmits the management information and the second data to the second vehicle, the management information including the first information and the second information. The first vehicle receives the management information and the first data from the server, and the second vehicle receives the management information and the second data from the server.