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  2. 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.

  3. 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 ...

  4. From CAPTCHA to catastrophe: How fake verification ... - AOL

    www.aol.com/captcha-catastrophe-fake...

    The fake CAPTCHA scam shows how messy the internet’s ad system has become, with everyone involved passing the buck. Guardio Labs points to ad networks like Monetag as a big part of the problem.

  5. reCAPTCHA - Wikipedia

    en.wikipedia.org/wiki/ReCAPTCHA

    reCAPTCHA Inc. [1] is a CAPTCHA system owned by Google.It enables web hosts to distinguish between human and automated access to websites. The original version asked users to decipher hard-to-read text or match images.

  6. 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.

  7. 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 ...

  8. 80 Acronym Examples You Should Know - AOL

    www.aol.com/50-acronym-examples-texting...

    CAPTCHA. Completely Automated Public Turing Test to tell Computers and Humans Apart. CD-ROM. Compact Disc Read-Only Memory. DVD. Digital Versatile Disc. Fios. Fiber Optic Service. GIF. Graphics ...

  9. 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.