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An Accessible CAPTCHA

An Accessible CAPTCHA. Chad Killingsworth Web Projects Coordinator. What is a CAPTCHA?. C ompletely A utomated P ublic T uring test to tell C omputers & H umans A part. Examples. Hotmail:. Blogger:. What’s the Purpose?. Prevent Spam. Do They Really Work? .

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An Accessible CAPTCHA

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  1. An Accessible CAPTCHA Chad KillingsworthWeb Projects Coordinator

  2. What is a CAPTCHA? Completely Automated Public Turing test to tell Computers & Humans Apart

  3. Examples Hotmail: Blogger:

  4. What’s the Purpose? • Prevent Spam Do They Really Work? • Missouri State 404 Error Submission Example

  5. What’s the Problem? • Most CAPTCHAs are solely visual – easier to implement • Completely unusable by the blind • Can cause problems for the color blind

  6. How to Make aCAPTCHA Accessible • Include an audio test

  7. Implementation • Text-to-speech synthesis – read the visual CAPTCHA • Separate test – user enters a word or series of numbers they hear

  8. Missouri State Example

  9. Implementation Details • Pre-generate test samples – does not require the server to do text-to-speech • Correct numbers require the ability to determine context

  10. When to Use a CAPTCHA • Public forms only – make campus only forms restricted

  11. References • The CAPTCHA Projecthttp://www.captcha.net/ • Standards Schmandardshttp://www.standards-schmandards.com/2005/captcha/

  12. Questions

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