Capacitive Touch Authentication via Geometric Rotation
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Solution Overview
Problem
Existing capacitive touch screen authentication methods face challenges in providing uniqueness and convenience when used as an identification or authentication means, especially with multi-touch schemes optimized for input rather than authentication.
Innovation Solution
A method that receives touch point information from a capacitive touch screen, identifies a specified touch point, coordinate-rotates the geometric relationship of touch points to match a designed geometric relationship, and authenticates whether the rotated relationship matches within a tolerance range, allowing for authentication even when the touch device is not aligned in a specific position or direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multi-touch scheme optimized for input means is used, then ease of operation is improved, but uniqueness for authentication is worsened
Solution Approach 1:
The touch device is segmented into multiple touch portions with distinct geometric positions. Each touch portion serves as an independent authentication element, allowing the system to verify the specific geometric arrangement of touched portions. This segmentation enables the device to maintain ease of multi-touch operation while providing unique authentication through the specific pattern and positions of touched portions.
Solution Approach 2:
The touch portions are arranged in an asymmetric geometric relationship that is unique to each touch device. This asymmetric arrangement ensures that even when multiple devices use the same multi-touch input scheme, the specific geometric positions and relationships between touch portions create unique authentication patterns. The asymmetry prevents common input patterns from being replicated across different devices.
2Reliability
If touch portions are arranged in fixed position in design, then uniqueness for authentication is improved, but adaptability to different positions and directions is worsened
Solution Approach 1:
The authentication system dynamically adapts to the actual geometric arrangement of touch portions during operation. Instead of requiring fixed alignment, the system calculates and compares the actual geometric relationships formed by touched portions against the designed geometric relationship. This dynamic approach allows the device to be authenticated regardless of its position or rotation on the touch screen, maintaining both uniqueness and adaptability.
Solution Approach 2:
The system changes the parameter of geometric relationship comparison from fixed position matching to relative position matching. By comparing the geometric relationships (distances, angles, ratios) between touch portions rather than their absolute positions, the system maintains uniqueness through the designed geometric arrangement while adapting to any position or direction the device is placed on the screen.
3Adaptability or versatility
If coordinate rotation is performed to match designed geometric relationship, then adaptability to different positions is improved, but calculation complexity is worsened
Solution Approach 1:
The system replaces complex coordinate rotation and transformation operations with simplified geometric relationship comparison. Instead of performing full coordinate system transformations, the system calculates key geometric parameters (such as distances between touch portions, angles, and position ratios) and compares these directly against the designed geometric relationship. This substitution reduces computational complexity while maintaining adaptability to different device positions and orientations.
Data Source
AI summary
A method for authenticating capacitive touch, executed through a system interworking with a capacitive touch screen supporting multi-touch, comprises receiving touch point information for touch points recognized as multi-touch through the capacitive touch screen, reading the touch point information and identifying a specified touch point corresponding to any one specified touch portion fixed and arranged in a previously specified position in design among touch portions of a touch device in which capacitively touchable touch portions are arranged according to a previously designed unique geometric relationship, coordinate-rotating the touch points or a geometric relationship for the touch points to match a designed geometric relationship based on a reference point corresponding to the specified touch point, and authenticating whether the coordinate-rotated geometric relationship matches the designed geometric relationship within a tolerance range or identifying the designed geometric relationship matching the coordinate-rotated geometric relationship within a tolerance range among the designed geometric relationships.