How end-to-end encryption works: why even WhatsApp cannot read your messages
Metadata: what a messaging app still knows when it cannot read a word
An end-to-end encrypted app cannot read your messages. But it must deliver each message, so it must see some things. What does a messaging app still know about you?
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All week, the messages of the gift group pass through Rono's server. Each one is scrambled, and he cannot read a word of it.
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Still, by Thursday, Rono has a hunch: something is being planned for him, and he can guess when. He has not read a single word. So what gave it away?
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