Security, captchas (2)

How does CAPTCHA really work? Also learn how Google's version measures how you use your mouse! (7-min. video, but ignore the long ad at the end) (2021-11)
How does CAPTCHA really work?  (keywords: Security, captchas)
Captchas: Why we need them, how they're evolving, and how you can solve them more easily. (2018-10)
Captchas  (keywords: Security, captchas)

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