Short-Range Wireless Device Authentication via Encrypted Key Exchange

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Solution Overview

Problem

Existing communication methods for establishing short-range wireless communication networks between devices lack secure and efficient mechanisms for sharing information, particularly in securing the exchange of authentication information to prevent unauthorized participation.

Innovation Solution

A method involving a first device receiving encrypted authentication information from a second device, decrypting it using its own authentication information, determining a secret key, and using this key for secure communication, which can include public key exchange or security card protocols to establish an encrypted communication channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If authentication information is exchanged in plaintext, then communication establishment is simple and fast, but security is compromised allowing unauthorized devices to participate

Engineering Contradiction:

ImprovesecurityVSAvoidcommunication protocol complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-sharing authentication information between trusted devices before actual communication. The first device and second device exchange authentication information in advance through a secure channel, so that when they need to communicate, they can directly use the pre-established trust relationship without complex real-time authentication protocols.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses an intermediary approach by introducing authentication information as a mediator between devices. Instead of devices directly verifying each other's identity through complex protocols, they use pre-shared authentication information as an intermediary credential that simplifies the verification process while ensuring security.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If encryption is applied to authentication information, then security is improved, but processing time and computational resources increase

Engineering Contradiction:

ImprovesecurityVSAvoidauthentication time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing encryption and key exchange before actual communication needs arise. Authentication information is encrypted and exchanged in advance when both devices are available, so that during actual communication, the authentication process is fast since the cryptographic work has already been completed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses disposable short-lived session keys for encryption rather than relying on long-term complex cryptographic protocols. Each authentication exchange uses ephemeral keys that are generated, used, and discarded quickly, reducing computational overhead while maintaining security.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS10771244B2Method for communication between devices and devices thereof

Publication Date: 2020.09.08 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed is a method of performing, by a first device, short-range wireless communication with a second device, the method including receiving, from the second device, second authentication information encrypted using first authentication information of the first device, decrypting the encrypted second authentication information by using the first authentication information, determining a secret key based on the decrypted second authentication information, and performing communication between the first device and the second device by using the determined secret key.