A TLS handshake happens when a client needs to establish a secure connection with a server. Most often, that means your browser is connecting to an HTTPS website. Before the browser sends sensitive data, the two sides need to agree on how they’ll protect that conversation.<\/p>\n
So, the handshake occurs at the beginning of a TLS-secured connection, before normal application data is exchanged. You usually never see it happening. It just sits between \u201cI want this website\u201d and the moment the page starts loading securely.<\/p>\n
Open an HTTPS website for the first time, and your browser typically starts the process after making a connection to the server. The client sends information about the TLS versions and cryptographic options it supports. The server responds with its choice and presents its digital certificate.<\/p>\n
Because the server needs to prove its identity, the browser checks the certificate before trusting the connection. Then both sides establish the keys they’ll use to encrypt the session.<\/p>\n
Think of the handshake as the quick introduction before a private conversation. They haven’t started discussing the actual website request in a meaningful way yet. They’re sorting out how the conversation will stay private.<\/p>\n
\u2022 A browser connects to an HTTPS server, usually right after the underlying network connection is ready.<\/p>\n
\u2022 The server’s certificate gets checked, because trusting a random server would rather defeat the point.<\/p>\n
\u2022 Encryption details are agreed upon during the exchange, with the exact steps depending on the TLS version.<\/p>\n
\u2022 After the handshake succeeds, encrypted application data can flow normally.<\/p>\n
Not necessarily. This is where things get interesting.<\/p>\n
If a secure connection is already available, the browser can reuse it instead of starting from scratch. TLS also supports session resumption, which lets a returning client establish security with less work. The result feels quicker because there’s less negotiation before the actual data starts moving.<\/p>\n
And modern browsers open several connections in some situations, so you shouldn’t imagine one giant handshake controlling an entire website. Different connections have their own rules.<\/p>\n
TLS 1.3 made the handshake shorter than older versions. It reduces the number of round trips needed before encrypted application data can be exchanged. That matters more than it sounds, especially on networks where every extra trip adds noticeable delay.<\/p>\n
A TLS handshake doesn’t always complete successfully. The browser may reject the certificate. The server and client might not support a compatible TLS version. Something else in the connection can also interrupt the process.<\/p>\n
When that happens, the secure session isn’t established, so the browser can’t safely continue with ordinary HTTPS traffic. You might see a certificate warning or a connection error instead.<\/p>","protected":false},"excerpt":{"rendered":"
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