cnp3-ebook

protocols/tls

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Since 2014, latency has become an important concern for web services. As access networks bandwidth continue to grow, latency is becoming a key factor that affects the performance of interactive web services. With TLS 1.2, the download of a web page requires a minimum of four round-trip-times, one to create the underlying TCP connection, one to exchange the ClientHello/ServerHello, one to exchange the keys and then one to send the HTTP GET and retrieve the response. This can be very long when the server is not near the client. TLS 1.3 aimed at reducing this handshake to one round-trip-time and even zero by placing some of the cryptographic handshake in the TCP handshake. This part will be discussed in the TCP chapter. We focus here on the reducing the TLS handshake to a single round-trip-time.

4 years ago

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