CAPTCHA stands for
- Turing test to tell
- Computers and
Invented by Luis Von Ahn in 2000, while solving a rising spam problem at Yahoo. Spam bots were creating thousands of fake accounts and Yahoo didn’t know how to solve this issue.
A test that a computer should not be able to pass, but should be able to grade.
Initially, based solely on warped text.
Then moved to image-based captcha.
Google acquired reCaptcha in 2009.
Machines were getting better and better and were solving even warped text captchas.
A new version of captcha was built based on images, to improve Google’s self-driving cars and Google Maps.
NoCaptcha and reCaptcha v3 tries to verify that you’re a human, based on your behaviour.
It’s well know that on the Web you’re being tracked. Thus companies can quite easily tell, based on your behaviour, whether you’re a human or not.