Inaccessible CAPTCHA: updating W3C advisory note

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Presentation transcript:

Inaccessible CAPTCHA: updating W3C advisory note Dr Scott Hollier OZeWAI 2018 Technology for everyone

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

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

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

Traditional CAPTCHA issues

Traditional CAPTCHA issues

Audio CAPTCHA Good luck!

Audio CAPTCHA Good luck!

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

Findings 20% of traditional CAPTCHAs can be cracked easily This figure is much higher using pattern-matching algorithms Not only are traditional CAPTCHA solutions (visual, audio) inaccessible but also insecure

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

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

The problem with reCAPTCHA

reCAPTCHA + AT = back to inaccessible CAPTCHA

Next steps Current draft (6 July 2018): https://www.w3.org/TR/turingtest/ Second draft likely to be released before end of year Would welcome your feedback when second draft is out Thanks everyone that provided feedback in the first round

E-mail: scott@hollier.info Website: hollier.info 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