How end-to-end encryption works: why even WhatsApp cannot read your messages
Forward secrecy in messaging: what a stolen key can and cannot open
A thief copies the encryption key from your phone. The thief also saved every encrypted message you sent before. How many of your old messages can that one key open?
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1
Picture a thief, a stranger to all of you, who broke into the chat server months ago and kept a copy of every scrambled message of your chat. One day, the thief gets a minute with your phone. You deleted those old messages long ago, but the thief copies the key of your chat out of it.
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2
If one key locked the whole chat, that key would open everything in the pile, back to your very first message.
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