1. An Accessible CAPTCHA Chad Killingsworth Web Projects Coordinator

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

3. Office or Department Examples Hotmail: Blogger:

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

5. Office or Department 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. Office or Department How to Make a CAPTCHA Accessible  Include an audio test

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

8. Office or Department Missouri State Example

9. Office or Department 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. Office or Department When to Use a CAPTCHA  Public forms only – make campus only forms restricted

11. Office or Department References  The CAPTCHA Project http://www.captcha.net/ http://www.captcha.net/  Standards Schmandards http://www.standards-schmandards.com/2005/captcha/ http://www.standards-schmandards.com/2005/captcha/

12. Office or Department Questions