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Inaccessible CAPTCHA: updating W3C advisory note

Learn about the accessibility challenges posed by traditional CAPTCHAs and discover modern alternatives that are more inclusive and secure. Find out how the W3C WAI APA Research Questions Task Force is working to update CAPTCHA guidelines. Dr. Scott Hollier, a digital accessibility specialist and co-founder of the Centre For Accessibility initiative, shares his expertise on this topic.

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Inaccessible CAPTCHA: updating W3C advisory note

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  1. Inaccessible CAPTCHA: updatingW3C advisory note Dr Scott Hollier PWAC 2019 Technology for everyone

  2. Who am I? • Professional: • Digital accessibility specialist • Active participant in W3C WAI APA Research Questions Task Force • Co-founder, Centre For Accessibility initiative • Academic: • Senior Lecturer, Professional Certificate in Web Accessibility, University of South Australia • Adjunct Senior Lecturer, Edith Cowan University • Personal: • Author of book ‘Outrunning the Night’ • Legally blind, first-hand knowledge of access issues

  3. What is CAPTCHA? • Completely Automated Public Turing test to Tell Computers and Humans Apart (CAPTCHA) • Purpose: to stop bots from harvesting data

  4. Traditional CAPTCHAs • Task: to identify a distorted set of characters from a bitmapped image, then enter those characters into a form.

  5. CAPTCHAs and web accessibility • Impossible for people with low vision • Incompatible with screen readers making it impossible for blind users • Assumes familiarity with the English character set • Not intuitive making it difficult for people with cognitive disabilities • Alternatives can be difficult too

  6. Traditional CAPTCHA issues

  7. Traditional CAPTCHA issues

  8. Audio CAPTCHA • Good luck!

  9. Audio CAPTCHA • Good luck!

  10. W3C WAI APA RQTF • Research Questions Task Force (RQTF) has researched CAPTCHAs and accessibility to update 12-year-old CAPTCHA advice document • Editors: • Scott Hollier • Janina Sajka • Michael Cooper • Contributors: Jason White, Judy Brewer, David Sloan

  11. Findings • Traditional CAPTCHAs can be cracked easily • Not only are traditional CAPTCHA solutions (visual, audio) inaccessible but also insecure

  12. Modern CAPTCHAs • reCAPTCHA • More visual CAPTCHAs (human V robot, man V woman, select cars, select plants) • Logic puzzles • Games • Federated identity • SMS • Biometrics

  13. reCAPTCHA checkbox • reCAPTCHA works by monitoring human movement. Works well for security and accessibility but still has a problem…

  14. The problem with reCAPTCHA

  15. reCAPTCHA + AT = back to inaccessible CAPTCHA

  16. Changes since July 2019 draft • reCAPTCHA now does a lot more identification about you as an individual to prepare for challenge • Updated guidance on how CAPTCHA now relies more on who you are specifically than knowing you are human

  17. Next steps • Current draft (6 July 2018): https://www.w3.org/TR/turingtest/ • Second draft approved internally, will turn up online any day now at same URL so watch www.w3.org/WAI for announcement • Call for feedback will be part of announcement

  18. Further information • E-mail: scott@hollier.info • Website: hollier.info • Mobile: +61(0)430 351 909 • Twitter: @scotthollier • Newsletter: newsletter@hollier.info • Book: outrunningthenight.com

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