Signal Fingerprinting for Network Device Authentication

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current wireless communication systems face challenges in efficiently managing increased bandwidth demand due to the proliferation of portable devices and reliance on broadband data access, particularly in providing reliable authentication and network management for devices in complex communication networks.

Innovation Solution

A guided wave communication system that utilizes electromagnetic waves bound to a transmission medium, such as wires, to transmit data without requiring an electrical return path, enabling efficient data transmission and authentication through fingerprint recognition of electromagnetic signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If traditional wireless communication systems are used to meet increasing bandwidth demand, then data usage capacity increases, but propagation loss increases and authentication reliability deteriorates

Engineering Contradiction:

Improvebandwidth capacityVSAvoidpropagation loss

Core Design Contradiction:

Quantity of substanceVSLoss of energy

Solution Approach 1:

The patent introduces an intermediate transmission medium (wire or cable) between the transmitter and receiver. Electromagnetic waves are guided along this intermediate medium, which confines the energy and reduces propagation loss compared to free-space wireless transmission. This intermediary structure enables reliable transmission over longer distances with lower energy loss.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces traditional electrical signal transmission through circuits with electromagnetic wave propagation guided by the transmission medium. This substitution allows for higher frequency operation and greater bandwidth capacity while maintaining efficient energy transfer through the guided wave structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If wireless authentication methods are used, then device connectivity is simplified, but authentication reliability and security deteriorate

Engineering Contradiction:

Improvedevice connectivityVSAvoidauthentication reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent uses signal fingerprinting, which characterizes the unique electromagnetic signature of each transmission medium-path combination. This fingerprint acts as an authentication identifier, allowing the system to verify the legitimacy of connected devices based on their unique physical path characteristics rather than relying solely on software-based authentication protocols.

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The transmission medium itself provides authentication functionality through its unique electromagnetic characteristics. The physical properties of the transmission path (impedance, attenuation, phase velocity) create a natural fingerprint that automatically identifies authorized devices, eliminating the need for separate complex authentication mechanisms.

Inventive Principle:

Principle #25Self-service

3Loss of energy

If guided wave transmission is implemented, then propagation loss is reduced, but device complexity increases due to transmission medium requirements

Engineering Contradiction:

Improvepropagation lossVSAvoidtransmission medium complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The transmission medium serves multiple functions simultaneously: it guides electromagnetic waves for data transmission, provides mechanical support for the connection, and enables authentication through its unique electromagnetic characteristics. This multi-functionality reduces the need for separate components and simplifies the overall system despite the sophisticated transmission capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This solution enhances data transmission efficiency by reducing propagation loss and eliminating the need for separate electrical return paths, while also providing a secure authentication method for network devices through signal fingerprinting.

Implementation Method 1

A guided wave communication system utilizes electromagnetic waves bound to a transmission medium, such as wires, to transmit data

Methodology Applied

Scientific EffectGuided electromagnetic waves: Waveguide

Implementation Method 2

A waveguide coupling device receives the guided waves from the transmission medium and couples the guided waves to a receiver

Methodology Applied

Scientific EffectWaveguide coupling: Waveguide

Data Source

PatentUS9913139B2Signal fingerprinting for authentication of communicating devices

Publication Date: 2018.03.06 AT&T INTELLECTUAL PROPERTY I L P

AI summary

Aspects of the subject disclosure may include, for example, accessing a profile including an expected fingerprint of expected parameters for received signals associated with a network path comprising a wired connection between network devices, comparing a fingerprint with the expected fingerprint where the fingerprint is generated from parameters measured from a signal, and authenticating a network device along the network path associated with the transmitting of the signal according to the comparing. Other embodiments are disclosed.