_Shortwave radio can be intercepted_
Spread-spectrum shortwave with frequency-jumping sequence determined by random single-use seed used by both transmitter and receiver is fairly difficult encryption to break. Method used since VietNam for uber-secure communications in military of messages that themselves are rarely clear text but have another level of encryption. Much easier today with compute power in cell phones. Just sayin'
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_Shortwave radio can be intercepted_ Spread-spectrum shortwave with frequency-jumping sequence determined by random single-use seed used by both transmitter and receiver is fairly difficult encryption to break. Method used since VietNam for uber-secure communications in military of messages that themselves are rarely clear text but have another level of encryption. Much easier today with compute power in cell phones. Just sayin'