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  2. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    The purpose of CAPTCHAs is to prevent spam on websites, such as promotion spam, registration spam, and data scraping. Many websites use CAPTCHA effectively to prevent bot raiding. CAPTCHAs are designed so that humans can complete them, while most robots cannot. [ 14 ] Newer CAPTCHAs look at the user's behaviour on the internet, to prove that ...

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

    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.

  4. 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 ...

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

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

    Use 2-step with authenticator app verification. Authenticator apps provide secure verification codes that act as the second step in 2-step verification. After entering your password, you'll need to enter the code generated by your authenticator app to sign in. Download an authenticator app from the Google Play Store or App Store.

  6. Recognize a hacked AOL Mail account

    help.aol.com/articles/recognize-a-hacked-aol...

    If you think your account has been compromised, follow the steps listed below to secure it. 1. Change your password immediately. 2. Delete app passwords you don’t recognize. 3. Revert your mail settings if they were changed. 4. Ensure you have antivirus software installed and updated.

  7. Challenge–response authentication - Wikipedia

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

    Challenge–response authentication. In computer security, challenge-response authentication is a family of protocols in which one party presents a question ("challenge") and another party must provide a valid answer ("response") to be authenticated. [1]

  8. Transaction authentication number - Wikipedia

    en.wikipedia.org/wiki/Transaction_authentication...

    A transaction authentication number (TAN) is used by some online banking services as a form of single use one-time passwords (OTPs) to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password authentication. TANs provide additional security because they act as a form of two-factor ...

  9. Multi-factor authentication - Wikipedia

    en.wikipedia.org/wiki/Multi-factor_authentication

    Multi-factor authentication is typically deployed in access control systems through the use, firstly, of a physical possession (such as a fob, keycard, or QR-code displayed on a device) which acts as the identification credential, and secondly, a validation of one's identity such as facial biometrics or retinal scan.