What the HTTPS padlock means: how your browser talks in secret on a Wi-Fi anyone can read
The TLS handshake: how HTTPS sets up a secret connection in one round trip
Before your browser sends a single word over HTTPS, it must agree on a key with the website. It must also check who is on the other end. The TLS handshake does all of this in one trip there and back.
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1
Miva is back on the real café Wi-Fi. Her phone starts with a hello, and the hello already carries its mix. It doesn't wait for the shop to ask.
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The shop answers in one go: its own mix, then, already scrambled with the new key it built from the two mixes, its certificate, its signature and a last word, "finished".
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