For Review: Inaccessibility of CAPTCHA - draft update

An updated draft of Inaccessibility of CAPTCHA: Alternatives to Visual Turing Tests on the Web is available for review and comment. It explores cryptographic authentication to verify humans versus bots. This uses W3C technologies that remove the need for interactive CAPTCHAs (Completely Automated Public Turing Test to distinguish between Computers and Humans).

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