Portable Device Location Verification Against Relay Attacks

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Solution Overview

Problem

Conventional real-time locating systems (RTLS) for determining the location of portable devices relative to objects are compromised by factors such as unexpected environmental objects and relay attacks, which affect accuracy and authorization processes.

Innovation Solution

A system and method involving a secondary portable device that communicates with a primary portable device to enhance location determination by comparing signal characteristics and zones, ensuring both devices are in proximity, thereby mitigating relay attacks and improving accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If location determination is based on wireless signal strength from a portable device, then the system can determine relative location, but the accuracy is adversely affected by environmental objects causing signal reflections

Engineering Contradiction:

Improvelocation determination accuracyVSAvoidsignal reflection from environmental objects

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a secondary portable device as an intermediary to verify the authenticity of the primary portable device's location. The secondary device, which is not initially configured to communicate with the object, receives communication parameters from the primary device and establishes independent wireless communications. This intermediary verification mechanism helps distinguish genuine signals from reflected or relayed signals, thereby improving location determination accuracy despite environmental interference.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the RTLS accepts communications from a portable device to authorize vehicle states, then authorization is enabled, but relay attacks can compromise the system by establishing wireless relays that fake proximity

Engineering Contradiction:

Improveauthorization processVSAvoidauthorization security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the object (e.g., vehicle) monitors and compares communication characteristics from both the primary portable device and the secondary portable device. The system analyzes signal strength, communication patterns, and temporal relationships to verify whether the devices are genuinely in proximity or being relayed through an attacker's device. This feedback loop enables the system to detect and reject relay attacks while maintaining legitimate authorization operations.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent requires that the secondary portable device be present and verify its location before authorization is granted. The system performs preliminary verification by checking that the secondary device, which receives parameters from the primary device, can independently communicate with the object within expected signal parameters. This preliminary action ensures that both devices are genuinely proximate to the object before any authorization occurs, preventing relay attacks that would otherwise exploit the authorization process.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If a locator function is trained in multiple environments to improve accuracy, then confidence increases, but the presence of objects absent from training environments still adversely affects accuracy

Engineering Contradiction:

Improvelocator function accuracyVSAvoidperformance in untrained environments

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent introduces a secondary portable device as an intermediary verification mechanism that operates independently of environment-specific training data. While the locator function may be trained in specific environments, the secondary device provides an additional layer of verification by checking communication parameters and signal characteristics. This intermediary approach helps mitigate the effects of untrained environmental objects because the verification process focuses on the relationship between devices rather than absolute signal characteristics that vary by environment.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enhances the accuracy of location determination by confirming that both devices are in the same zone, reducing the risk of relay attacks and improving the reliability of authorization processes.

Implementation Method 1

The antenna system may be configured to communicate wirelessly with the primary portable device and the object

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS12445804B2System and method of determining real-time location

Publication Date: 2025.10.14 DENSO INTERNATIONAL AMERICA INC

AI summary

A system and method for determining location information of a portable device relative to an object is provided. The system and method may include communicating with a secondary portable device separate from the portable device, which may be considered a primary portable device. The secondary portable device may be not be configured to communicate with the object or unaware that it is communicating with the object, and may receive communication parameters from the primary portable device.