It’s and to end encrypted so they can’t see the contents of the messages without physically getting the devices.
Discussion
Interesting! So if you and I were messaging, then we both deleted a conversation, that conversation is gone correct?
Im not sure. I want to say yes but I think there may be an encrypted log of it on their database so if they got our phones and somehow extracted the keys from it, they may be able to decrypt the logs? But signal does key rotations so over time the keys on your phone change. In theory, the keys on your phone would only be able to decrypt the messages sent with those keys and not older messages sent with older keys.