![]() ![]() However, they are still compromised to human-assisted relay attacks due to having a limited number of challenges and can be only solved using trusted devices. Almost all cognitive-based CAPTCHAs with sensor support have not yet been compromised by automated attacks. However, with the introduction of fourth-generation bots accurately mimicking human behavior, a secure CAPTCHA would be hardly designed without additional special devices. Invisible reCAPTCHA and some approaches have not yet been cracked. However, automated attacks have effectively cracked all common conventional schemes, and the majority of present CAPTCHA methods are also vulnerable to human-assisted relay attacks. ![]() Various CAPTCHA schemes have been proposed over the years, principally to increase usability and security against emerging bots and hackers performing malicious operations. CAPTCHA ( Completely Automated Public Turing test to tell Computers and Humans Apart) has long been used to keep automated bots from misusing web services by leveraging human-artificial intelligence (HAI) interactions to distinguish whether the user is a human or a computer program. ![]()
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