CAPTCHA is a crucial security tool to verify human users and protect websites from bots, but faces challenges.

because screen readers cannot read text and image CAPTCHAs. Alternative CAPTCHAs, like audio-based challenges, remain problematic. Users in the study agreed on audio CAPTCHA solutions only 31% of ...

Google’s reCAPTCHA tool claims to block bot access ... all users were asked to pass a challenge by transcribing distorted text into a box, then in reCAPTCHAv2, only half of users had to complete ...

In 2007 Luis von Ahn had a good idea: why not use CAPTCHAs to help digitize scanned text from books and newspapers that computers struggled to read. His creation, called reCAPTCHA, proved so ...