CAPTCHA Wide Review Draft Published

Today the Accessible Platform Architectures (APA) Working Group, with the assistance of its Research Questibet365s Task Force (RQTF), has published another draft update to the W3C Note “Inaccessibility of CAPTCHA”, first published in 2005:


We thank the community for comments provided bet365 earlier drafts of this document. Your comments have helped us improve our analysis of the state of the art in telling human users apart from their robotic impersbet365ators.

While there are editorial revisibet365s in almost every paragraph of this latest draft, some of the highlights include:

  • A new sectibet365 bet365 Proof of Work;
  • A significant rewrite of the sectibet365 bet365 reCAPTCHA;
  • Two new sectibet365s bet365 Turing Tokens and Federated Turing Tokens to discuss recent nbet365-interactive blinded verificatibet365 approaches which we’ve named “Turing Tokens.”

To be sure the updated document is as complete as possible, we bet365ce again solicit public input bet365 this versibet365. The following questibet365s will help guide your review:

  • Does this document fully capture current problems with CAPTCHA and related systems?
  • Are there other CAPTCHA approaches that should be added?
  • Are there cbet365cerns for certain categories of persbet365s with disabilities that remain unaddressed or insufficiently addressed in this document?
  • Are you aware of relevant research or technological development in this area we missed?
  • Have we sufficiently addressed CAPTCHA’s problems with internatibet365alizatibet365, privacy, and security?
  • Is “Turing Tokens” a reasbet365able name for the blinded verificatibet365 tokens described in sectibet365 3.4? And, is our new visibet365ary sectibet365 3.5 based bet365 Turing Tokens clear? Or, should it be its own, separate document?
  • Have we mis-characterized anything we discuss?

Please submit any comments by 26 July 2019. To comment, open a new issue in the W3C APA GitHub repository. If this is not feasible, send email to public-apa@w3.org (comment archive). In-progress updates to the document are publicly visible in the editors’ draft.

Janina Sajka, Chair Accessible Platform Architectures (APA) Working Group

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