Digital Key Sharing With Transfer Restrictions for Secure Lending

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Solution Overview

Problem

Existing key information sharing systems face challenges in securely sharing key information between user terminals and third-party terminals, leading to decreased convenience and potential security risks during object sharing or lending scenarios.

Innovation Solution

A key information sharing system that includes a delivery device capable of adding secondary information to key information, allowing secure transfer between user and third-party terminals without the need for the delivery device, while also enabling restriction of control operations and usage periods or regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If key information is generated in the user terminal and transferred to the third-party terminal, then sharing convenience is improved, but security of the object decreases

Engineering Contradiction:

Improvesharing convenienceVSAvoidobject security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The delivery device serves as an intermediary between the user terminal and the third-party terminal. It adds transfer restriction information to the key information before delivery, ensuring that the key information can only be transferred through authorized channels. This mediator approach allows sharing convenience while maintaining security by controlling the transfer process centrally.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The delivery device performs preliminary action by adding transfer restriction information to the key information before it reaches the user terminal. This pre-configured restriction information ensures that subsequent transfers to third-party terminals are controlled and secure, preventing unauthorized use while enabling legitimate sharing.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the user terminal holds all key information, then security is maintained, but sharing and lending convenience decreases

Engineering Contradiction:

ImprovesecurityVSAvoidsharing convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The key information is segmented into two parts: the original key information and the transfer restriction information. The transfer restriction information is further divided into components that enable controlled transfer to third-party terminals. This segmentation allows the system to maintain security through the restriction information while enabling sharing through the transfer capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the key information have different functions: the original key information provides authentication capability, while the added transfer restriction information provides controlled transfer capability. This local quality differentiation allows simultaneous achievement of security (through authentication) and sharing convenience (through controlled transfer).

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11783648B2Key information sharing system, delivery device and user terminal

Publication Date: 2023.10.10 TOYOTA JIDOSHA KK

AI summary

A server that shares key information to a portable terminal includes processing circuitry configured to deliver the key information to the portable terminal. The key information is associated with an object equipped with a control device, and the control device performs a predetermined control to the object when the control device receives the key information from an external terminal. The key information includes restriction information, where the restriction information sets a restriction content for the predetermined control.