3D Trajectory Authentication Using Inertial Sensors
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Solution Overview
Problem
Conventional screen locks on smartphones, such as Android patterns, are vulnerable to smudge attacks and shoulder surfing due to their two-dimensional nature and ease of observation, leading to inadequate security for protecting sensitive information.
Innovation Solution
An authentication system that utilizes a three-dimensional continuous trajectory detected by an inertial sensor, allowing users to move an electronic device through a specific path in three-dimensional space, which is then compared to a registered standard trajectory for authentication, enhancing security by eliminating visible grease trails and allowing false motion inputs to confuse observers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional 2D screen lock pattern is used, then the ease of operation is improved, but the security against smudge attacks and shoulder surfing is worsened
Solution Approach 1:
The patent transitions from 2D screen lock patterns to 3D air drawing trajectories. The system detects the three-dimensional path of a user's hand movement through air using camera imaging, creating a spatial trajectory that serves as the authentication pattern. This dimensional change eliminates the visible grease trail problem of 2D touch screens while maintaining ease of operation through natural hand drawing motions.
2Ease of manufacture
If a 2D touch screen pattern is used, then the ease of manufacture is improved, but the resistance to smudge attacks is worsened
Solution Approach 1:
The patent introduces air space as an intermediary medium between the user's finger and the detection system. Instead of direct contact with a touch screen, the user draws patterns in air, and the system captures this invisible trajectory through camera imaging. This intermediary approach eliminates grease trails on the screen while maintaining pattern recognition functionality.
3Device complexity
If a 2D pattern lock is used, then the device complexity is reduced, but the password strength is worsened
Solution Approach 1:
The patent enhances password strength by moving from 2D to 3D pattern space. The authentication pattern becomes a three-dimensional trajectory defined by multiple spatial coordinates and directional movements, dramatically increasing the number of possible combinations while maintaining reasonable system complexity through standardized detection algorithms.
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
The system significantly increases password complexity and resistance to smudge and shoulder surfing attacks, offering over 2855.5 times more combinations than conventional 3×3 screen locks, thereby enhancing the security of electronic devices.
Implementation Method 1
an inertial sensor, for detecting the moving of the electronic apparatus from the first position to the second position and thus constructing a three-dimensional continuous trajectory
Data Source
AI summary
The present invention relates to an authentication method for electronic apparatus and authentication system, which comprises the steps of: enabling an electronic apparatus to be moved by a user from a first position to a second position; enabling an inertial sensor embedded in the electronic apparatus to detect and thus constructing a three-dimensional continuous trajectory of the electronic apparatus's movement from the first position to the second position in a Cartesian coordination system composed of a first-direction axis, a second-direction axis and a third-direction axis; and enabling a processor embedded in the electronic apparatus to perform either a process for registering the three-dimensional continuous trajectory as a standard movement trajectory; or a comparison between the three-dimensional continuous trajectory and a previously registered standard movement trajectory so as to authenticate the correctness of the three-dimensional continuous trajectory and thus authenticating the electronic apparatus.