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  2. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    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 (/ ˈkæp.tʃə / KAP-chə, originally the acronym CAPTCHA) [1][2][3][4] is a type of challenge–response test used in computing to determine whether the user is human ...

  3. 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. Version 2 also asked users to decipher text or match images if the analysis of cookies and canvas rendering suggested the page ...

  4. Fix issues with AOL Mail image challenges

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

    Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. Fix issues with AOL Mail image challenges. AOL Mail uses many security measures to keep your account secure, one of which is CAPTCHA or image challenges when sending mail.

  5. 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.

  6. Challenge–response authentication - Wikipedia

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

    TRIAD includes a list of three-letter challenge codes, which the verifier is supposed to choose randomly from, and random three-letter responses to them. For added security, each set of codes is only valid for a particular time period which is ordinarily 24 hours. Another basic challenge-response technique works as follows.

  7. Optical character recognition - Wikipedia

    en.wikipedia.org/wiki/Optical_character_recognition

    Video of the process of scanning and real-time optical character recognition (OCR) with a portable scanner. Optical character recognition or optical character reader (OCR) is the electronic or mechanical conversion of images of typed, handwritten or printed text into machine-encoded text, whether from a scanned document, a photo of a document, a scene photo (for example the text on signs and ...

  8. Wikipedia : Request an account

    en.wikipedia.org/wiki/Wikipedia:Request_an_account

    Being unable to create an account for yourself is typically due to: Having trouble or being unable to see or complete the required CAPTCHA image verification step.; Choosing a username that is too similar to an existing username (in these cases, an account creator can approve the creation of similar usernames if certain criteria are met).

  9. NuCaptcha - Wikipedia

    en.wikipedia.org/wiki/NuCaptcha

    NuCaptcha is an early fraud detection service which utilises behavior analytics to provision threat appropriate, animated video CAPTCHAs. NuCaptcha is developed and operated by Canada -based firm NuData Security. [1][2][3][4] Static image-based CAPTCHAs are routinely used to prevent automated sign-ups to websites by using text or images of ...