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Published byEthel Spencer Modified over 9 years ago
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An Accessible CAPTCHA Chad Killingsworth Web Projects Coordinator
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Office or Department What is a CAPTCHA? Completely Automated Public Turing test to tell Computers & Humans Apart
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Office or Department Examples Hotmail: Blogger:
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Office or Department What’s the Purpose? Prevent Spam Do They Really Work? Missouri State 404 Error Submission Example
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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
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Office or Department How to Make a CAPTCHA Accessible Include an audio test
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Office or Department Implementation Text-to-speech synthesis – read the visual CAPTCHA Separate test – user enters a word or series of numbers they hear
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Office or Department Missouri State Example
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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
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Office or Department When to Use a CAPTCHA Public forms only – make campus only forms restricted
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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/
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Office or Department Questions
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