Is this human readable?
What characters are in the picture?
One more
We will be crazy if we see these
OMG,What's the answer?
IQ Test?
Are you a normal person?
You know how blind people read?
ASCII Picture
Are you an adult?
3D verification code
reCaptcha
You know how blind people read?
ASCII Picture
Are you an adult?
3D verification code
reCaptcha
It increase a new feature recently. It display the Google Street View address and names .
Facebook's face detection : Nice idea, huh?
Microsoft's ASIRRA
DISTCHA : Similar to iPhone/iPad's slider
MotionCAPTCHA : Use mouse to draw a picture
siteHelp's DragCapCha
jQuery s3Capcha plugin
Ajax Fancy Captcha
wCaptcha
Picatcha
yoCaptcha
W3C Recommendations
The article Inaccessibility of CAPTCHA on W3C says that traditional picture CAPTCHA has the problem of inaccessibility, they are also easily broken.
Facebook's face detection : Nice idea, huh?
Microsoft's ASIRRA
DISTCHA : Similar to iPhone/iPad's slider
MotionCAPTCHA : Use mouse to draw a picture
siteHelp's DragCapCha
jQuery s3Capcha plugin
Ajax Fancy Captcha
Picatcha
yoCaptcha
W3C Recommendations
The article Inaccessibility of CAPTCHA on W3C says that traditional picture CAPTCHA has the problem of inaccessibility, they are also easily broken.
- aiCaptcha: Using AI to beat CAPTCHA and post comment spam
- Breaking CAPTCHAs Without Using OCR
- PWNtcha – CAPTCHA decoder
W3C also gives some possible solutions
- Logical puzzles
- Sound output
- Limited-use accounts
- Spam filtering
For more information you can check this page.
Original author : 陈皓 Source : http://coolshell.cn/articles/7917.html
