2.3.1 SSL/TLS (Secure Sockets Layer / Transport Layer Security)
SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are related secure communication technologies that make use of public key encryption and key exchange, and X.509 certificates, discussed in more detail in Chapter 4.
To use SSL and TLS, you need to generate a digital certificate (some platforms offer tools to do this) or obtain one from a certificate authority. Again, see Chapter 4 for more information.
In terms of OSI layers, SSL and TLS sit above TCP/IP, but below application protocols such as HTTP or IMAP.
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