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Escape from CAPTCHA
by Matt May
Table of contents
- Accessibility Problems with Visual Verification Systems
- Escape from CAPTCHA
- In the beginning...
- Enter the bad guys
- The showdown
- What's a Turing test?
- Who's trapping users?
- The truth about cats and mice
- Building a better mousetrap
- Hierarchy of access
- Privilege
- Humanity
- Identity
- What is W3C doing about this?
- Approach: logic
- Approach: sound
- Approach: credit-card validation
- Approach: live operators
- Approach: limited-use accounts
- Approach: post-hoc checking
- Approach: single sign-on
- Approach: public-key infrastructure
- Approach: biometrics
- The wrap-up