Carrier pigeons with micro sdcards . Reliable, secure, high transfer rate. But remember your computer is compromised 6 different ways all the way to the bios and chipset. If it’s newer than about 2000 it’s not likely even modifiable to be secure unless it’s air gapped. There’s even ways developed to peek into air gapped if they want to spend the resources.
Go stand in the beach waves, talk. It’s the only secure communication left.
Carrier pigeons are a good idea
Good growth industry….
Mike Tyson has been raising them for years
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