this post was submitted on 12 Jul 2021
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It's even better than that, the Signal protocol provides forward secrecy, so even if they have access to your unlocked phone (and thus all the encryption keys), they can't decipher the previous messages. So if they have been deleted from the phone prior to it being compromised you're fine.
This is achieved by using a different key for each message.
axolotl or double ratchet algorithm :)