色の恒常性を利用したcolorCAPTCHAの提案

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  • Proposal of ColorCAPTCHA Using Color Constancy

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Activities by bots such as illegally acquiring accounts, sending spam mail and participating in online voting are problem. In order to counter these problems, a technology called CAPTCHA to discriminate humans and bots was developed. CAPTCHA is widely used on the web sites to prevent the spam behavior. CAPTCHA, which is currently the mainstream, has a function that allows a user to solve a character displayed on the screen or to distinguish what appears in a photograph. These existing CAPTCHAs are getting easily broken by the development of OCR technology and machine learning technology. In order to counter this problem, we propose a new CAPTCHA, which is called color homeostasis, utilizing advanced cognitive ability naturally provided to humans and difficult to imitate by bots. The proposed CAPTCHA uses an image obtained by adding a color interference filter to the image. We use 11 basic colors (black, white, red, green, yellow, blue, brown, purple, pink , orange, gray) for the answer. The answer area is displayed at a random position, but the user can move the answer area to an arbitrary place by dragging or clicking. A case in which the color selected by the user from the color palette selected is the closest color to that of the original image, the color selection is regarded as correct.

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