Picture Password Offset Grid for Small Display Precision
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Solution Overview
Problem
Conventional picture password systems are cumbersome and inaccurate on small display devices, such as smartphones, due to the difficulty in precisely selecting grid locations with a finger or stylus, leading to reduced entropy and usability issues across varying display sizes.
Innovation Solution
A device and method that overlays a grid on an image for picture password authentication, allowing input at one location to highlight an element at a second offset location, maintaining or improving precision and entropy by adjusting the offset based on touch diameter or saved values, and enabling seamless use across different display sizes with various input types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional picture password system uses direct grid selection on small displays, then the system is simple to implement, but the selection accuracy and entropy are reduced due to the difficulty in precisely selecting grid locations with a finger or stylus
Solution Approach 1:
The patent introduces an offset mechanism as an intermediary between the user's touch input and the actual grid element selection. When a user touches a location on the display, the system calculates an offset based on the touch diameter and selects a grid element at the offset location rather than directly at the touch point. This intermediary offset compensation resolves the contradiction by improving selection accuracy without requiring users to precisely target small grid elements with their fingers or stylus on small displays.
2Measurement precision
If the grid elements are made larger to improve selection accuracy on small displays, then the selection becomes easier, but the entropy of the picture password system is reduced
Solution Approach 1:
The patent dynamically changes the offset parameter based on the touch diameter and display characteristics. By adjusting the offset magnitude, the system compensates for the imprecision of direct selection on small displays without altering the actual grid element sizes. This maintains the original grid configuration and its associated entropy while improving selection accuracy through parameter-based compensation rather than structural changes to the grid itself.
3Measurement precision
If an offset mechanism is introduced to improve selection accuracy, then the precision improves, but the device complexity increases
Solution Approach 1:
The offset mechanism implements precision improvement through parameter adjustment rather than structural complexity. The system calculates offsets based on stored touch diameter values and applies simple coordinate transformations. This approach achieves improved accuracy through mathematical parameter compensation while maintaining relatively simple system architecture, avoiding the need for complex hardware modifications or elaborate software structures.
Data Source
AI summary
Embodiments described herein relate to a device operable to process input for a picture password for proof of knowledge. In some embodiments, the device includes a display, an input subsystem, processor(s), and memory containing instructions executable by the processor(s) such that the device is operative to display, on the display of the device, an image for the picture password proof of knowledge. The image is associated with an overlaid grid comprising a plurality of elements, and each element corresponds to a distinct area of the image. The device is further operative to, determine an offset to be used and, in response to receiving an input via the input subsystem at a first location of the display, highlight an element of the overlaid grid at a second location on the first image on the display. The second location is offset from the first location by the offset.