DDIM-CAPTCHA: A Novel Drag-n-Drop Interactive Masking CAPTCHA against the Third Party Human Attacks


A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a security mechanism that can be used to distinguish between humans and machines. Most existing CAPTCHA systems are vulnerable against a so-called "third party human attack." The third party human attack employs hired human to solve challenges so that the CAPTCHA… (More)
DOI: 10.1109/TAAI.2013.41


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