Smartphone Magnetic Field Code Authentication
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Solution Overview
Problem
Existing methods for secure access in phone applications, such as NFC and QR codes, are cumbersome, error-prone, and unreliable due to size constraints, additional components, and sensitivity to lighting conditions.
Innovation Solution
A method and device using a magnetic sensor and processor in a handheld wireless communication device to sense and decode a sequence of polarities in a short-range magnetic field, transmitting the code and identification information for secure access, which is maintained as long as the device is within range of the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If NFC transceiver is added to smartphone for automatic token transfer, then ease of operation is improved, but device complexity and real estate usage increase
Solution Approach 1:
The patent reuses the smartphone's existing camera component for multiple purposes: traditional photography and scanning magnetic field codes. By making the camera multi-functional, the system achieves automatic token transfer capability without adding dedicated NFC hardware, thus improving ease of operation while avoiding increased device complexity
Solution Approach 2:
The system uses the smartphone's built-in magnetic field sensor (already present for other functions like compass) to detect and read the code from the magnetic field. This self-service approach allows the device to perform automatic authentication using existing components rather than requiring new specialized hardware
2Ease of operation
If NFC transceiver is added to smartphone, then ease of operation is improved, but manufacturing cost and real estate usage increase
Solution Approach 1:
The patent makes the camera multi-functional by using it for both traditional photography and scanning magnetic field codes. This eliminates the need for separate dedicated authentication hardware, reducing manufacturing costs while maintaining automatic token transfer capability
Solution Approach 2:
The system leverages existing smartphone components (camera and magnetic field sensor) to perform authentication functions. By making existing components serve multiple purposes, the patent avoids additional manufacturing costs associated with new specialized hardware
3Ease of operation
If QR code is used for automatic transfer, then ease of operation is improved, but reliability deteriorates due to lighting conditions
Solution Approach 1:
The patent replaces optical-based QR code scanning with magnetic field-based code detection. Since magnetic fields are not affected by lighting conditions, this substitution maintains the ease of automatic transfer while significantly improving reliability in various lighting environments
Solution Approach 2:
The patent changes the physical parameter used for code transmission from optical (light-reflecting QR codes) to magnetic (magnetic field patterns). This parameter change makes the code detection immune to lighting conditions, thereby improving reliability while maintaining automatic transfer functionality
4Reliability
If manual entry of token is required, then security is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces manual keyboard entry with automatic magnetic field-based code detection. The system automatically captures the code through the camera and magnetic sensor, eliminating the need for manual typing while maintaining security through the use of magnetic field authentication
Solution Approach 2:
The system performs automatic code capture and authentication without requiring user interaction for manual entry. The smartphone's camera and magnetic sensor automatically detect and process the authentication code, providing both security and ease of operation
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
Provides secure, reliable, and personalized access to secure systems without the need for additional components or being affected by lighting, ensuring continuous access as long as the device remains within the magnetic field range.
Implementation Method 1
sensing, by at least a magnetic sensor of a handheld wireless communication device, a sequence of polarities of a short-range magnetic field
Data Source
AI summary
Systems and methods for code communication are provided. A secure system wirelessly transmits, via a magnetic field transmitter, an access code to a handheld wireless communication device as a sequence of polarities of a short-range magnetic field. The wireless communication device senses the sequence of polarities and determines the code from the sensed sequence of polarities. The code provides access to the secure system. The handheld wireless communication device can wirelessly transmit the code received from the short-range magnetic field and identification information to the secure system to receive access to the secure system. The access is personalized based on at least the identification information and is maintained or validated when the handheld wireless communication device is within range of the short-range magnetic field.