The connection is private (or has confidentiality) because a symmetric-key algorithm is used to encrypt the data transmitted.When secured by TLS, connections between a client (e.g., a web browser) and a server (e.g., ) will have all of the following properties: : §1 However, applications generally use TLS as if it were a transport layer, even though applications using TLS must actively control initiating TLS handshakes and handling of exchanged authentication certificates. It serves encryption to higher layers, which is normally the function of the presentation layer. TLS runs "on top of some reliable transport protocol (e.g., TCP)," : §1 which would imply that it is above the transport layer. TLS and SSL do not fit neatly into any single layer of the OSI model or the TCP/IP model. If any one of the above steps fails, then the TLS handshake fails and the connection is not created. This concludes the handshake and begins the secured connection, which is encrypted and decrypted with the session key until the connection closes. uses Diffie–Hellman key exchange (or its variant elliptic-curve DH) to securely generate a random and unique session key for encryption and decryption that has the additional property of forward secrecy: if the server's private key is disclosed in future, it cannot be used to decrypt the current session, even if the session is intercepted and recorded by a third party.
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