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  2. Message authentication code - Wikipedia

    en.wikipedia.org/wiki/Message_authentication_code

    Informally, a message authentication code system consists of three algorithms: A key generation algorithm selects a key from the key space uniformly at random. A MAC generation algorithm efficiently returns a tag given the key and the message. A verifying algorithm efficiently verifies the authenticity of the message given the same key and the tag.

  3. ssh-keygen - Wikipedia

    en.wikipedia.org/wiki/Ssh-keygen

    ssh-keygen is a standard component of the Secure Shell (SSH) protocol suite found on Unix, Unix-like and Microsoft Windows computer systems used to establish secure shell sessions between remote computers over insecure networks, through the use of various cryptographic techniques.

  4. Mutual authentication - Wikipedia

    en.wikipedia.org/wiki/Mutual_authentication

    The message is then decrypted with Bob's secret key, giving Alice's ID. Bob checks if the message matches a valid user. If not, the session is aborted. Bob sends Alice a message back to show that Bob is a valid user. Alice verifies the message: Alice checks the format and timestamp. If either is incorrect or invalid, the session is aborted.

  5. Key exchange - Wikipedia

    en.wikipedia.org/wiki/Key_exchange

    Key exchange (also key establishment) is a method in cryptography by which cryptographic keys are exchanged between two parties, allowing use of a cryptographic algorithm. In the Diffie–Hellman key exchange scheme, each party generates a public/private key pair and distributes the public key. After obtaining an authentic copy of each other's ...

  6. Challenge–response authentication - Wikipedia

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

    The use of information which is randomly generated on each exchange (and where the response is different from the challenge) guards against the possibility of a replay attack, where a malicious intermediary simply records the exchanged data and retransmits it at a later time to fool one end into thinking it has authenticated a new connection ...

  7. 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 verification if you need to.

  8. Use Face, Fingerprint or PIN to sign in to AOL

    help.aol.com/articles/use-face-fingerprint-or...

    Use Face, Fingerprint or PIN to sign in to AOL Entering a password to sign in to your AOL account can sometimes feel like a hassle, especially if you forget it. If your smart device is enabled with biometric authenticators like a fingerprint sensor or facial recognition technology, you can sign in with ease.

  9. Secure Shell - Wikipedia

    en.wikipedia.org/wiki/Secure_Shell

    For example, it introduces new key-exchange mechanisms like Diffie–Hellman key exchange, improved data integrity checking via message authentication codes like MD5 or SHA-1, which can be negotiated between client and server.