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  2. Add, replace or remove AOL account recovery info - AOL Help

    help.aol.com/articles/add-or-update-aol-account...

    Add, replace or remove AOL account recovery info. Keep a valid mobile phone number or email address on your account in case you ever lose your password or run into a prompt to verify your account...

  3. 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...

  4. Why am I asked to verify my account after signing in?

    help.aol.com/articles/why-am-i-asked-to-verify...

    You may be prompted to get a verification code at your recovery phone number or recovery email address for any of the following reasons: • AOL notices suspicious account activity. • You're...

  5. Primality test - Wikipedia

    en.wikipedia.org/wiki/Primality_test

    A primality test is an algorithm for determining whether an input number is prime. Among other fields of mathematics, it is used for cryptography. Unlike integer factorization, primality tests do not generally give prime factors, only stating whether the input number is prime or not.

  6. Check verification service - Wikipedia

    en.wikipedia.org/wiki/Check_verification_service

    A check verification service provides businesses or individuals with either the ability to check the validity of the actual check or draft being presented, or the ability to verify the history of the account holder, or both.

  7. Checksum - Wikipedia

    en.wikipedia.org/wiki/Checksum

    The simplest checksum algorithm is the so-called longitudinal parity check, which breaks the data into "words" with a fixed number n of bits, and then computes the bitwise exclusive or (XOR) of all those words. The result is appended to the message as an extra word.