The ingenious part of this handshake, and the reason TLS works in practice, is its use of public key cryptography (also known as asymmetric key cryptography), which allows the peers to negotiate a shared secret key without having to establish any prior knowledge of each other, and to do so over an unencrypted channel.Īs part of the TLS handshake, the protocol also allows both connection peers to authenticate their identity. The TLS protocol specifies a well-defined handshake sequence to perform this exchange, which we will examine in detail in “TLS Handshake”. In order to establish a cryptographically secure data channel, the connection peers must agree on which ciphersuites will be used and the keys used to encrypt the data. Integrity A mechanism to detect message tampering and forgery. Authentication A mechanism to verify the validity of provided identification material. Encryption A mechanism to obfuscate what is sent from one computer to another.
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