Vehicle Portable Terminal Authentication via Server-Mediated Token

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Solution Overview

Problem

Existing vehicle systems require complex authentication methods for registering portable terminals, which can be cumbersome and are not effective when wireless communication with a server is unavailable.

Innovation Solution

A vehicle system that simplifies the authentication process by allowing a portable terminal to receive the vehicle's public key via short-range communication, using a vehicle identifier like a QR code or bar code, and transmitting this information along with its own public key to a server to generate and verify tokens for registration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If complicated authentication methods are used to register a portable terminal in a vehicle, then security is improved, but ease of operation deteriorates

Engineering Contradiction:

ImprovesecurityVSAvoidease of operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

A server acts as an intermediary between the portable terminal and the vehicle. The server receives public keys from both devices, generates a token, and facilitates authentication without requiring complex direct communication protocols between the terminal and vehicle. This mediator approach simplifies the user experience while maintaining security through cryptographic verification.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If wireless communication with a server is required for registration, then security is improved, but adaptability deteriorates when server connectivity is unavailable

Engineering Contradiction:

ImprovesecurityVSAvoidadaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Public keys are exchanged and stored in advance during an initial setup phase when server connectivity is available. This preliminary action allows the system to perform registration without real-time server communication, enabling offline authentication while maintaining security through pre-established cryptographic credentials.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If public key exchange is performed through multiple steps, then security is improved, but productivity deteriorates due to increased registration time

Engineering Contradiction:

ImprovesecurityVSAvoidregistration speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent combines public key exchange, token generation, and authentication verification into a single integrated server-mediated process. Instead of separate sequential steps for key exchange and authentication, the server consolidates these operations, reducing the number of communication rounds and accelerating the registration process while maintaining cryptographic security.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP3421303B1Vehicle system and control method thereof

Publication Date: 2022.02.16 HYUNDAI MOTOR CO LTD

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AI summary

A vehicle system (99) may include a vehicle (100) configured to store a public key of the vehicle (100) and a private key of the vehicle (100); a portable terminal (200) configured to store the public key of the vehicle (100), a public key of the portable terminal (200), and a private key of the portable terminal (200); and a server (300) configured to generate a token and encrypt the token with the public key of the vehicle (100) and the public key of the portable terminal (200).