In-Vehicle Communication Timing for Unauthorized Device Detection

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Solution Overview

Problem

Existing in-vehicle communication systems are vulnerable to security breaches if encryption keys are obtained through unauthorized means, compromising network security.

Innovation Solution

An in-vehicle apparatus that determines whether a connected device is unauthorized by analyzing the sending and reception time points of communication data, comparing these times to pre-measured estimated times for authorized devices, and detecting deviations to identify unauthorized devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If message authentication using encryption keys is implemented, then security of communication is improved, but vulnerability to key compromise increases

Engineering Contradiction:

Improvecommunication securityVSAvoidkey compromise vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the authentication parameter from encryption keys to communication timing characteristics. By measuring and comparing the time required for a device to process and respond to communication data, the system establishes a new authentication mechanism that does not rely on secret keys, thereby eliminating key compromise vulnerability while maintaining security.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If timing-based authentication is implemented, then detection of unauthorized devices is improved, but communication overhead increases

Engineering Contradiction:

Improveunauthorized device detectionVSAvoidcommunication overhead

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies partial action by measuring timing characteristics only for authentication purposes rather than continuously monitoring all communication aspects. The system measures the time required to process specific authentication data, which is a subset of normal communication operations, thereby achieving detection functionality with minimal additional overhead.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250310739A1In-vehicle apparatus, information processing method, and program

Publication Date: 2025.10.02 AUTONETWORKS TECH LTD

AI summary

An in-vehicle apparatus is an in-vehicle apparatus installed in a vehicle and configured to perform communication with at least one in-vehicle device connected to an in-vehicle network of the vehicle, the in-vehicle apparatus including a control unit configured to perform control related to the communication, wherein the control unit acquires a sending time point and a reception time point of communication data sent and received during the communication with the in-vehicle device, and determines whether or not the in-vehicle device that has performed the communication is an unauthorized device based on the acquired sending time point and reception time point.