Graphical Passcode Authentication via Dynamic Parameter Envelopes
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Solution Overview
Problem
Existing password systems for electronic devices are prone to being forgotten and easily guessed, lacking intuitive and secure access methods that account for user variability in inputting graphical passcodes.
Innovation Solution
The system uses graphical passcodes recorded on a touchscreen or touchpad, capturing timing, pressure, speed, and coordinate data, and defines an envelope of acceptable parameters to authenticate user input, allowing for variations in input patterns to ensure secure access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alphanumeric keypad passwords are used, then security is provided, but users easily forget or confuse passwords between different devices
Solution Approach 1:
The patent replaces the mechanical keypad entry system with a graphical touch-based system. Users create and enter passwords by drawing graphical patterns on a touchscreen display, eliminating the need to type alphanumeric sequences on keypads. This substitution makes passwords more intuitive and easier to remember while maintaining security through complex graphical patterns.
Solution Approach 2:
The patent changes the parameter space of password entry from discrete alphanumeric characters to continuous graphical coordinates and stroke dynamics. By capturing timing data, pressure magnitude data, speed data, and coordinate data of touchscreen interactions, the system creates a richer parameter space that enables more memorable yet secure authentication patterns.
2Ease of operation
If simple and easily remembered passwords are used, then ease of operation is improved, but security is compromised as passwords may be deduced
Solution Approach 1:
The patent adds multiple dimensions to password complexity beyond simple character sequences. By incorporating timing data, pressure magnitude data, speed data, and coordinate data of touchscreen strokes, the system creates multi-dimensional authentication patterns that are easy to remember (simple graphical gestures) but hard to deduce (complex temporal and spatial patterns).
Solution Approach 2:
The patent combines multiple data types (coordinate information, timing data, pressure magnitude data, speed data) to create a composite authentication pattern. This composite approach integrates simple user-friendly graphical input with complex security verification, achieving both ease of operation and strong security.
3Reliability
If graphical passcodes are used with strict parameter matching, then security is improved, but user variability in input patterns causes authentication failures
Solution Approach 1:
The patent implements dynamic parameter envelopes that adapt to user input patterns. Instead of fixed threshold matching, the system creates flexible envelopes around expected timing, pressure, speed, and coordinate values that accommodate natural variations in user input while maintaining security through pattern recognition.
Solution Approach 2:
The patent transforms the authentication approach from exact parameter matching to parameter range validation. By defining acceptable ranges (envelopes) for timing data, pressure magnitude data, speed data, and coordinate data, the system tolerates natural input variability while still verifying the authenticity of the graphical passcode pattern.
Data Source
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Figure 2C~2D
AI summary
A method and system for electronic access security uses touches and movements on a touch sensitive surface to determine graphical passcode that are used in a manner similar to passwords. Graphical passcodes comprise various combinations of swipes, taps or drags on a touchscreen surface as defined by a user. A user's selected graphical passcode is stored in memory for comparison to subsequent entries of graphical passcode in order to authenticate the users. An envelope may be generated to define a range of acceptable pressure, speed, coordinate positions or other parameters, as a function of time or position, required for passcode authentication. The envelope may be stored in a computer memory and is used to authenticate a user by determine whether an entered graphical passcode falls within the envelope.