What the HTTPS padlock means: how your browser talks in secret on a Wi-Fi anyone can read
Man-in-the-middle attack: why a secret key is useless with the wrong person
Encryption stops a stranger from reading the talk between your phone and a website. So an attacker on the same Wi-Fi stops listening. Instead, he puts himself in the middle of the talk.
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1
Copies are not enough for Rono's plan: he wants to stand between Miva and the shop. So his laptop sends out a Wi-Fi of its own, with the café's name. Miva's phone joins it, and from now on every packet she sends goes to Rono first.
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2
Her phone sends its mix, meant for the shop. Rono keeps it and sends back a mix of his own. The phone builds a key with him, sure it is talking to the shop.
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