Go long sealing wax, short software
Looks like that's going to be the safest way to communicate, unless you don't mind the Stasi sucking up all your intimate communications and sniffing through them at leisure.*
And maybe we're getting a little insight into why the Post Office has to be destroyed, eh? Not just because public purpose is bad, and not just for yet more rental to be extracted through the chitinous mandibles of our parasitical elites, but because an envelope can't be opened digitally? Can't have that.
Besides, it's beautiful stuff (but see the Wikipedia entry for details on the wax used for modern postal sorting processes).
NOTE * What part of "secure in their papers and effects" do these assholes not understand?
NOTE ** Interestingly, a tamper-proof technology similar to sealing wax was used in ancient clay bullae, a precursor to cuneiform. Babylonian IT used bulla to authenticate commericial transactions over distance.