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That's what apps like Silence are for. Of course, there's always traffic analysis. https://f-droid.org/repository/browse/?fdfilter=silence&fdid=org.smssecure.smssecure !fdroid
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The Silence app is needed on both sides for encrypted texting. If the sender doesn't have the key for the recipient then a key exchange message is sent automatically, followed by the encrypted message. If the recipient doesn't have the Silence app then the message is sent in plaintext. I don't know the details of the key exchange, or what overhead the key probing incurs. !crypto
Former Bob Jonkman -- Please use the new server at https://gs.jonkman.ca
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