How end-to-end encryption works: why even WhatsApp cannot read your messages
Chat backups: where an end-to-end encrypted chat can leak
Your messages travel locked from phone to phone. But every night, your phone may send a copy of all your chats to the cloud. Who can read that copy?
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1
That copy is a cloud backup. If Miva loses her phone, her new phone fetches the backup, and every chat is back.
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2
Inside the phone, the chat is plain words: the phone must show it to Miva. So the copy that leaves is a copy of the words themselves.
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