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The key that they exchange may then be used with a symmetric encryption algorithm-the bulk cipher-to encrypt the actual data in the secure channel. The key exchange algorithm determines how the client and server authenticate during a TLS handshake.
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To confirm the authenticity of individual messages, the sender computes a message authentication code using (H)MAC. To confirm the identity of the server (and optionally, the client) during the TLS handshake, the protocol uses an authentication mechanism.