Dynamic Mobile Device Timeout Based on Ambient Signals
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Solution Overview
Problem
Existing mobile device security measures, such as password timeouts, often balance convenience and security, but fail to adapt dynamically to changing risk levels based on location and environmental factors, leading to either excessive inconvenience or increased risk of data theft.
Innovation Solution
The solution involves adjusting screen timeouts on mobile devices based on measurements of ambient wireless signals, geo-location, and risk assessments, using RFID tags and audio noise to determine the risk level, allowing for dynamic adjustment of timeout intervals to match the security needs of different environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard minimum timeout interval (e.g., 5 minutes) is set on mobile devices, then security risk is reduced, but user convenience deteriorates due to frequent password entries
Solution Approach 1:
The timeout interval is made dynamic rather than fixed, automatically adjusting based on the device's geographic location and detected ambient signals. The system transitions from a static timeout setting to a dynamic one that adapts to environmental context, resolving the contradiction by applying stricter security only when and where needed.
Solution Approach 2:
The timeout parameter is changed based on external conditions (location, signal environment). The system monitors geographic coordinates and ambient wireless signals, then adjusts the timeout interval parameter accordingly - shorter in high-risk areas, longer in low-risk areas - optimizing both security and convenience.
2Ease of operation
If a longer timeout interval is set to improve user convenience, then password entry frequency decreases, but security risk increases due to extended unprotected periods
Solution Approach 1:
The timeout interval dynamically adapts to the current environment rather than remaining fixed. The system continuously evaluates location and ambient signal data to determine the appropriate timeout duration, allowing longer intervals only when environmental assessment indicates low risk.
Solution Approach 2:
The system implements feedback loops where ambient signal measurements and location data continuously inform timeout interval adjustments. The timeout setting responds to environmental feedback, extending only when sensor data indicates a safe context, thus maintaining security while improving convenience.
3Ease of operation
If biometric authentication systems are added to speed up authentication, then user convenience improves, but device complexity and cost increase due to additional hardware
Solution Approach 1:
The patent substitutes physical/biometric authentication hardware with an environmental context-based authentication approach. Instead of adding fingerprint scanners or facial recognition cameras, the system uses existing sensors (GPS, ambient signal detectors) to infer authentication context, achieving fast authentication without additional hardware complexity.
Solution Approach 2:
The system makes existing device components multi-functional by using the GPS and ambient signal detectors (already present for other purposes) to also determine authentication timeout context. This avoids adding dedicated biometric hardware while achieving similar convenience benefits.
Data Source
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AI summary
Methods, devices, and systems are disclosed for altering a mobile electronic device's screen timeout based on a number of ambient wireless signals, geographic location, check-in to social location web sites, tagged venues, or other measures. Audio noise can be used in conjunction with the number of signals to determine if the device's user is in a crowded venue where theft of the device is more likely. A ringtone can be altered in addition to the password timeout time. A distance from an employee badge can be used to determine if the device has been left behind by a user, and the device can accelerate its password-protected timeout.