Inaccessibility of CAPTCHA: Alternatives to Visual Turing Tests on the Web

“A common method of limiting access to services made available over the Web is visual verification of a bitmapped image. This presents a major problem to users who are blind, have low vision, or have a learning disability such as dyslexia. This document examines a number of potential solutions that allow systems to test for human users while preserving access by users with disabilities.” (W3C) – courtesy of accessify

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