Communication Device Range Validation for Vehicle Network Security

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Solution Overview

Problem

Existing communication devices in vehicle networks are susceptible to data leakage due to tampering, leading to improper operations and unauthorized transmission of messages outside the intended vehicle network.

Innovation Solution

A communication device connected to a mobility network that includes a holding unit for range information, a receiving unit to receive messages, and a determining unit to validate messages using range information such as TTL, RTT, MAC addresses, or IP addresses to prevent unauthorized transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a transmission source communication device performs control for preventing data leakage, then data security is improved, but the system becomes vulnerable to tampering leading to improper operations and data leakage

Engineering Contradiction:

Improvedata securityVSAvoidtampering vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of having the transmission source device control data leakage prevention, the patent inverts the control to the receiving end. The receiving communication device determines whether to discard or forward messages based on range information, making the system resistant to transmission source tampering while maintaining data security

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces range information (TTL, RTT, MAC addresses, IP addresses) as an intermediary mechanism. This intermediary data allows the receiving device to independently verify message legitimacy without relying on the transmission source's control, thereby preventing tampering while maintaining security

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If range information is used to determine message validity, then data leakage prevention is achieved, but device complexity increases

Engineering Contradiction:

Improvedata leakage preventionVSAvoidcommunication device complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent makes the receiving device multi-functional by enabling it to perform both message reception and range validation functions. This eliminates the need for separate control mechanisms at the transmission source, preventing data leakage without proportionally increasing overall system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The receiving device performs self-validation by independently checking range information against stored criteria. This self-service approach eliminates the need for complex centralized control systems, achieving data leakage prevention with minimal additional complexity

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP3661128B1Communication device, communication method, and communication system

Publication Date: 2025.07.16 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

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AI summary

A communication device (100a) is a communication device connected to a mobility network which is a network mounted in a mobility and which is used by a plurality of electronic control devices for communication. The communication device (100a) includes: a holding unit (105) which holds range information indicating a transferable path range determined for a message on the mobility network; a receiving unit (101) which receives the message on the mobility network; and a determining unit (104) which determines validity of the received message by using the range information.