Wearable Authentication Device Removal Detection
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Solution Overview
Problem
Existing authentication methods using wearable devices like rings are insecure when the device is lost or removed, as they do not prevent unauthorized access and often require external power sources.
Innovation Solution
A wearable device with a photocell and microcontroller that powers infrared components to detect when the device is being worn, locking the authentication credentials when removed and requiring an unlock code for reactivation, using passive power technologies like NFC and a photocell to eliminate the need for a battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wearable authentication device uses a battery or external power source, then it can continuously monitor and authenticate user presence, but it increases device complexity and requires maintenance
Solution Approach 1:
The wearable device uses a photocell that converts ambient light into electrical energy, enabling the device to power itself without external batteries or power sources. This self-powered mechanism allows continuous operation of the authentication system while eliminating the complexity of power source management, maintenance, and replacement.
2Reliability
If the wearable device continuously monitors wear status, then it can prevent unauthorized access when lost, but it consumes more energy
Solution Approach 1:
Instead of continuous monitoring, the device uses a photocell to detect ambient light conditions periodically. When light levels indicate the device has been removed from the user's body (e.g., a ring removed from a finger), the system triggers an authentication challenge requiring the user to verify their identity before the device can be used again. This periodic detection approach minimizes energy consumption while maintaining security.
3Reliability
If the device requires an unlock code for reactivation, then it enhances security when removed, but it reduces ease of operation
Solution Approach 1:
The system proactively detects when the wearable device has been removed from the user's body using the photocell sensor. Upon detection, it immediately activates an unlock code requirement or authentication challenge before the device can be used again. This preliminary anti-action prevents unauthorized access by ensuring that any removal event triggers verification, balancing security with user convenience through automated detection.
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
Enhances security by ensuring the wearable device can only authenticate when worn by the authorized user and eliminates the need for external power sources, providing secure and battery-free operation.
Implementation Method 1
a photocell that may be configured to provide power to at least one of a microcontroller, an infrared light emitting diode ('LED'), and a computer readable storage module
Implementation Method 2
an infrared LED configured to emit a first signal received from the microcontroller
Implementation Method 3
a reflective material that is configured to reflect the first signal from the infrared LED
Implementation Method 4
The coil may generate power from an electromagnetic field of the second device that powers the microchip
Data Source
AI summary
A wearable device is disclosed that, while being worn by a user, may allow a user to authenticate to a second device such as a smartphone without having to enter an unlock code such as a personal identification number. The wearable device may detect when the user removes it. Removal of the wearable device may cause it to be disabled and prevent it from being used to authenticate a subsequent user to the second device until it is re-enabled.