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CAPTCHA
CAPTCHA ,[object Object],[object Object],[object Object]
CAPTCHA ,[object Object],[object Object],[object Object]
CAPTCHA ,[object Object],[object Object],[object Object]
Contd… ,[object Object],[object Object],[object Object]
Origin ,[object Object],[object Object]
Contd… ,[object Object],[object Object]
Characteristics ,[object Object],[object Object],[object Object]
Accessibility ,[object Object],[object Object]
Contd… ,[object Object]
Contd… ,[object Object]
EZ-Gimpy ,[object Object],[object Object],[object Object],[object Object]
Contd… ,[object Object],[object Object],[object Object]
Generating CAPTCHAs :Bongo Answer: left
Contd… ,[object Object],[object Object],[object Object]
Sound Based CAPTCHAs:Eco ,[object Object],[object Object],[object Object]
Text Based CAPTCHAs
Character Recognition ,[object Object],[object Object],[object Object],[object Object],[object Object]
Contd… ,[object Object],[object Object],[object Object]
Graphic Based CAPTCHAs
Image-recognition CAPTCHAs   ,[object Object],[object Object]
Principles ,[object Object],[object Object],[object Object],[object Object],[object Object]
CAPTCHA would  look like… ,[object Object],[object Object],[object Object]
Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Applications ,[object Object],[object Object],[object Object]
Contd… ,[object Object]
Applications ,[object Object],[object Object]
Applications ,[object Object],[object Object]
Applications ,[object Object],[object Object]
Applications ,[object Object],[object Object],[object Object],[object Object]
Applications ,[object Object],[object Object]
Conclusion ,[object Object],[object Object]
[object Object]

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Captchas