Combining Movement Model with Finger-Stroke Level Model Towards Designing a Security Enhancing Mobile Friendly CAPTCHA

Although many solutions have been proposed for peripheral device controlled desktop applications to separate Human-Bot using CAPTCHAs, no significant work has addressed the same issue for handheld touch-sensitive devices. In this work, we propose a novel CAPTCHA system based on flicking or dragging segmented sub-images to a specific output box to regenerate a sample image. The successful matching of sample and output images can be considered to be submitted by humans only if the movement data of dragging object shows a human-like pattern and threshold crossing mismatch with the pattern for dragging performed by the bot. We designed the prototype of our proposed CAPTCHA for both PC and Mobile platform to underline the subtle, yet inevitable difference between key-stroke and…