The service provides multi-factor authentication by encrypting one-time authentication codes as image-based CAPTCHA challenges. Users must answer challenge questions by correctly choosing from a series of photos to gain access to the protected resource. It is intended to create easy-to-use but highly secure protection.
API methods support generation of a visual CAPTCHA block, along with an audio block for alternative access. The API returns HTML to be incorporated into a page that implements the challenge specified by the request.
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