Wireless Encryption Key Exchange Using Exponential Magnetic Field Decay

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Solution Overview

Problem

The conventional method of exchanging encryption keys between mobile devices and accessories is insecure, as it requires manual entry of a PIN code, which can be observed and compromised, especially when devices lack display or data entry capabilities, and the need for a significant number of digits complicates accurate transfer.

Innovation Solution

A method and system for wirelessly exchanging encryption keys using a signal that decreases exponentially with distance, such as a modulated magnetic field, allowing secure key transfer between devices within a predetermined range, like 2-5 centimeters, using a transmitter and receiver with a controller to determine proximity and initiate key exchange.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual entry of PIN code is used for encryption key exchange, then security can be established, but the method is vulnerable to observation and compromise, and requires display and data entry capabilities

Engineering Contradiction:

ImprovesecurityVSAvoidobservation vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical manual entry system (keyboard/keypad) with a magnetic field-based wireless transmission system. A transmitter generates a magnetic field that decreases exponentially with distance, allowing the PIN code to be transmitted wirelessly to the receiver without manual entry, thereby eliminating observation vulnerability while maintaining security.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary medium to transfer the PIN code between devices. The transmitter converts the PIN code into a magnetic field signal that can be received wirelessly, serving as a secure intermediary that eliminates the need for manual entry and display capabilities.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a significant number of digits are used in PIN code for security, then security level improves, but accuracy of transfer between devices decreases

Engineering Contradiction:

Improvesecurity levelVSAvoidtransfer accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent replaces the manual transcription process with automatic wireless magnetic field transmission. This eliminates human error in transferring long PIN codes while maintaining the required security level, as the entire code is transmitted automatically without manual intervention.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If wireless connection is established for convenience, then ease of operation improves, but security against interception worsens

Engineering Contradiction:

Improvewireless connection convenienceVSAvoidinterception risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical parameter of signal propagation by using a magnetic field that decreases exponentially with distance rather than conventional electromagnetic waves. This creates a highly localized transmission zone that maintains wireless convenience while dramatically reducing interception risk, as the signal strength drops off rapidly beyond a very short range.

Inventive Principle:

Principle #35Parameter changes

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 approach enhances security by making it difficult for third parties to intercept the key and eliminates the need for manual entry, improving user convenience and security by using simple, low-maintenance components like magnets and Hall effect switches.

Implementation Method 1

transmitting the encryption key from the first device using a signal that is strong enough to transmit over a predetermined distance while having a strength that decreases exponentially with distance

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

having a strength that decreases exponentially with distance

Methodology Applied

Scientific EffectExponential decay:

Implementation Method 3

using simple, low-maintenance components like magnets and Hall effect switches

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentUS8024811B2System and method for secure PIN exchange

Publication Date: 2011.09.20 MALIKIE INNOVATIONS LTD

AI summary

A system and method for wirelessly exchanging an encryption key between a first device and a second device. The system generally includes: a transmitter, provided to the first device, for transmitting a signal that is strong enough to transmit over a predetermined distance while having a strength that decreases exponentially with distance, for example a magnetic field signal; a receiver, for example a Hall effect switch, provided to the second device, for receiving the signal; and a controller for determining when the first device and the second device are within the predetermined distance and controlling the transmitter to transmit the encryption key based on the determination.