Common CAPTCHA tests consist of squiggly numbers and letters with textured backgrounds that users would need to identify and type in a text box. The foremost tool used to filter out bots is the Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA).ĬAPTCHA is a type of challenge-response test, which, in theory, only humans can pass. Doing so enables operators to filter out spam, unauthorized web crawling, large numbers of fake account registrations, comments and reviews, and most of all, attacks from bot-originating web traffic. Nowadays, it is imperative for online services to determine if web traffic comes from humans or automated bots.
With contributions from Philippe Lin, Fyodor Yarochkin, Matsukawa Bakuei, and Ryan Flores
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