The unCaptcha system was designed to target the audio challenges presented by reCAPTCHA, but the security experts who designed it revealed that it could defeat other systems as well, including BotDetect, Yahoo, and PayPal image challenges, all with high accuracy. Soon after the system was revealed by computer science experts from the University of Maryland (UM), Google updated its security service to mitigate the attack, but unCaptcha has been updated to bypass the mitigations. The unCaptcha system was created in April 2017 to target Google’s reCAPTCHA and similar security systems that aim at protecting websites from spam and abuse, and was able to defeat those with high accuracy. The unCaptcha automated system can once again bypass Google’s reCAPTCHA challenges, despite major updates to the security service.
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