"George William Herbert" wrote

Done properly, especially with one time pad encryption,
one can handle this sort of situation.

Consider... the use of CD-R's for pads. They give you 650
megabytes of storage. Assume one message of 1k contents
per minute is sent; that works out to a bit over 43 megabytes
of pad per month, or about 518 megabytes per year. Each receiving
station can have its own pad and its own recipient keying.

And then when one of those CD's gets lost or captured...

Pete