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  2. reCAPTCHA - Wikipedia

    en.wikipedia.org/wiki/ReCAPTCHA

    In 2013, reCAPTCHA began implementing behavioral analysis of the browser's interactions to predict whether the user was a human or a bot. The following year, Google began to deploy a new reCAPTCHA API, featuring the "no CAPTCHA reCAPTCHA"—where users deemed to be of low risk only need to click a single checkbox to verify their identity. A ...

  3. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

  4. Fix issues with AOL Mail image challenges - AOL Help

    help.aol.com/articles/what-should-i-do-if-i-get...

    AOL Mail uses many security measures to keep your account secure, one of which is CAPTCHA or image challenges when sending mail. These challenges exist to make it harder for hackers to access your accounts. The characters can't be read by a computer and must be entered manually, ensuring only a real person can pass the test. Why am I being ...

  5. Human presence detection - Wikipedia

    en.wikipedia.org/wiki/Human_presence_detection

    reCAPTCHA is a CAPTCHA-like system designed to establish that a computer user is human (normally in order to protect websites from bots) and, at the same time, assist in the digitization of books. A sensor based on a piezoelectric film (EMFI sensor) is used to detect mechanical vibrations and the presence of a person seated on the rear bench of ...

  6. Exclusive: Google launching reCAPTCHA for payments - AOL

    www.aol.com/finance/exclusive-google-launching...

    A quick primer on terminology here: CAPTCHA stands for "completely automated public Turing Test to tell computers and humans apart," and it's a security measure (often asking users to select ...

  7. Turing test - Wikipedia

    en.wikipedia.org/wiki/Turing_test

    CAPTCHA is a form of reverse Turing test. Before being allowed to perform some action on a website, the user is presented with alphanumerical characters in a distorted graphic image and asked to type them out. This is intended to prevent automated systems from being used to abuse the site.

  8. Add or disable 2-step verification for extra security - AOL Help

    help.aol.com/articles/2-step-verification...

    Add an extra security step to sign into your account with 2-step verification. Find out how to turn on 2-step verification and receive a verification code, and how to turn off 2-step verification if you need to.

  9. Challenge–response authentication - Wikipedia

    en.wikipedia.org/wiki/Challenge–response...

    Challenge-response protocols are also used in non-cryptographic applications. CAPTCHAs, for example, are meant to allow websites and applications to determine whether an interaction was performed by a genuine user rather than a web scraper or bot.