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2. What's a six-digit verification code — and why you should ...

   www.aol.com/whats-six-digit-verification-code...

   For example, you might get a text message or email with a six-digit code that you must enter when you log into your bank account. This extra level of protection keeps scammers and hackers out.

3. 3-D Secure - Wikipedia

   en.wikipedia.org/wiki/3-D_Secure

   3-D Secure is a protocol designed to be an additional security layer for online credit and debit card transactions. The name refers to the "three domains" which interact using the protocol: the merchant/acquirer domain, the issuer domain, and the interoperability domain.

4. Message authentication code - Wikipedia

   en.wikipedia.org/wiki/Message_authentication_code

   Formally, a message authentication code (MAC) system is a triple of efficient [4] algorithms (G, S, V) satisfying: G (key-generator) gives the key k on input 1 n, where n is the security parameter. S (signing) outputs a tag t on the key k and the input string x. V (verifying) outputs accepted or rejected on inputs: the key k, the string x and ...

5. ISO 8583 - Wikipedia

   en.wikipedia.org/wiki/ISO_8583

   File update code 92: an 2: File security code 93: an 5: Response indicator 94: an 7: Service indicator 95: an 42: Replacement amounts 96: b 64: Message security code 97: x+n 16: Net settlement amount 98: ans 25: Payee 99: n ..11: Settlement institution identification code 100: n ..11: Receiving institution identification code 101: ans ..17 ...

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

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

   6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1. Sign in to your AOL account with your password. 2. Enter the verification code shown in your authenticator app. 3. Click Verify.

7. Identify legitimate AOL websites, requests, and communications

   help.aol.com/articles/identify-legitimate-aol...

   We never ask for personal info, such as credit card numbers or passwords, in emails. However, from time to time, we'll ask you to update your recovery info after signing in. You'll also get a notification titled “Your AOL account information has changed” if any info in your account settings are updated.

8. What is a credit card security code? - AOL

   www.aol.com/finance/credit-card-security-code...

   A credit card security code is a three- or four-digit code that’s unique to your card. In case a merchant asks, the security code goes by a few different names , mainly the: Card Verification ...

9. What Is a Credit Card Security Code and Why Is It ... - AOL

   www.aol.com/credit-card-security-code-why...

   A card security code is a three- or four-digit number on the back of credit and debit cards that ensures the authenticity of transactions when a physical card is not presented at the point of sale ...