CAPTCHAs are those now ubiquitous challenges you encounter to prove that you’re a human and not a bot when you go to log in to many websites. As a computer scientist, I see CAPTCHAs as an effective ...

From warped text to invisible AI scoring: the complete history of CAPTCHAs, how spammers beat them, and what comes next in the post-CAPTCHA era. Updated 2026.

For years, Google has used the simple system of distorted text CAPTCHAs to determine whether users were humans or robots. Robots used to be unable to decipher distorted text, so they always failed the ...

Why it matters: The usefulness of Captcha tests depends on their ability to deter bots without significantly inconveniencing human users. Although not yet peer-reviewed, the results of a new study ...

The cyber-underground menu of criminal services now includes on-demand, human-assisted CAPTCHA-breaking functionality, researchers are warning — meaning that website admins should look to implement ...