How end-to-end encryption works: why even WhatsApp cannot read your messages
The Signal protocol: how a chat heals after a key is stolen
Your old messages are safe, but a thief with your key can still read your new ones. With the Signal protocol, the chat locks the thief out again by itself, and you do not even notice. How?
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The thief reads along, message after message. Yet soon the stolen key will open nothing at all, and you will not even notice the moment. What shuts the thief out?
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It starts with something small. Miva writes back, and clipped to her reply is a public key her phone made a moment ago, just for this reply.
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