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  2. Email authentication - Wikipedia

    en.wikipedia.org/wiki/Email_authentication

    The first token after the field name, receiver.example.org, is the ID of the authentication server, a token known as an authserv-id. A receiver supporting RFC 8601 is responsible to remove (or rename) any false header claiming to belong to its domain so that downstream filters cannot get confused.

  3. Message authentication code - Wikipedia

    en.wikipedia.org/wiki/Message_authentication_code

    However, non-repudiation can be provided by systems that securely bind key usage information to the MAC key; the same key is in the possession of two people, but one has a copy of the key that can be used for MAC generation while the other has a copy of the key in a hardware security module that only permits MAC verification. This is commonly ...

  4. Digital signature - Wikipedia

    en.wikipedia.org/wiki/Digital_signature

    Alice signs a message—"Hello Bob!"—by appending a signature computed from the message and her private key. Bob receives both the message and signature. He uses Alice's public key to verify the authenticity of the signed message. A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A ...

  5. Message authentication - Wikipedia

    en.wikipedia.org/wiki/Message_authentication

    Message authentication or data origin authentication is an information security property that indicates that a message has not been modified while in transit (data integrity) and that the receiving party can verify the source of the message. [1] Message authentication does not necessarily include the property of non-repudiation. [2] [3]

  6. 2-Step Verification with a Security Key - AOL Help

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

    Sign in and go to the AOL Account security page.; Under "2-Step Verification," click Turn on.; Click Security Key.; Follow the onscreen steps to add your Security Key. Add additional recovery methods in case your Security Key is lost.

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

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

    2. Next to "2-Step Verification," click Turn on. 3. Select Phone number for your 2-step verification method. 4. Follow the on-screen prompts to complete the process. Sign in with 2-step for phone. 1. Sign in to your AOL account with your password. 2. Enter the verification code sent to your phone. 3. Click Verify.