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Learn what a message authentication code (MAC) is, how it works, and why it is used for authenticating and integrity-checking messages. Compare MAC with cryptographic hash functions, digital signatures, and other cryptographic primitives.
HMAC is a type of message authentication code that uses a cryptographic hash function and a secret key. Learn how HMAC works, how to implement it, and what variants are available, such as HMAC-SHA256 and HMAC-SHA3-512.
Learn how to turn off 2-step verification and receive a verification code to sign into your AOL account. You can use phone verification or authenticator app verification to add an extra security step.
Learn why you may be asked to verify your account after entering the correct password and how to update your recovery options. This is a security feature that protects your account from unauthorized access.
Message authentication is a property that a message has not been modified or altered while in transit and that the receiving party can verify the source of the message. It is typically achieved by using message authentication codes, authenticated encryption, or digital signatures.
A security key is a physical device that gets uniquely associated with your AOL account after you enable it. Each time you sign in with your password, you'll be prompted to approve access to your account using your key.
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