Touchscreen Force Sensor Duress Detection
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Solution Overview
Problem
Communication devices face the challenge of detecting duress situations when users are forced to enter security codes under coercion, as existing security measures do not effectively differentiate between normal and coerced password entry.
Innovation Solution
Incorporating force sensors and processors in communication devices to detect contact and force applied during password input, identifying a duress condition when the input password matches a stored password and exceeds a predetermined force threshold, triggering a duress handling procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If force sensors are added to detect contact force during password input, then the ability to detect duress conditions is improved, but the device complexity increases
Solution Approach 1:
The patent combines force sensing capability with the existing touchscreen interface by integrating force sensors beneath the touchscreen surface. This merging approach allows the device to detect both touch location and contact force using a unified input interface, improving duress detection without adding separate physical components.
Solution Approach 2:
The touchscreen interface is designed to serve multiple functions: it detects normal touch input for password entry and simultaneously measures contact force to identify duress conditions. This multi-functionality eliminates the need for separate detection mechanisms while enhancing security capabilities.
2Speed
If the device initiates duress handling procedures automatically, then security response time is improved, but false alarm risk increases
Solution Approach 1:
The system uses force magnitude as a distinguishing parameter to differentiate between normal and coerced password entry. By establishing a force threshold, the device can automatically identify duress conditions and trigger appropriate security responses without requiring additional verification steps.
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
Enables the device to automatically initiate security measures or alert mechanisms when a duress situation is detected, enhancing security by differentiating between voluntary and coerced password entries.
Implementation Method 1
the one or more force sensors may comprise one or more piezoelectric sensors
Data Source
Figure 1
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Figure 6A~6B
AI summary
A communication or computing device having a touchscreen interface is adapted to detect a duress condition upon user access through input of a gesture-based password or authentication code. One or more force sensors are provided for detection of force applied at the touchscreen surface, and interoperate with processing elements to detect input of a gesture-based password through contact at the touchscreen interface; determine that force detected by at least one of the force sensors during input of the password exceeds a predefined threshold; and compares the input password with previously stored information to determine that the input password substantially corresponds to the previously stored information. If the input password substantially corresponds to the previously stored information and the detected pressure exceeds the threshold, a duress condition is determined for the device.