Is the old handwritten letter the most private form of communication in this modern digital age?
36-40, M
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Invisible · 26-30, M
No. It's trivial to inspect the contents of an envelope without even opening it. Your best bet is to use proven encryption protocols on a device that is not connected to the internet and to put the encrypted data on a medium such as a USB drive that can then be used to send it from an insecure device