>   How do they exchange public keys?  Via email I'll bet.

Note that it is trivial(*) to construct a self-decrypting
archive and mail it in the form of an attachment.  The
recipient will merely have to know the passphrase.  If
transit confidentiality is your aim and old versions 
of documents are irrelevant once the ink is dry on the
proverbial bond paper, this is quite workable and involves
no WoT at all, just POTS.

--dan

* trivial: memorizable by clerks in an all Windows world...


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