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If you were interesting to them, they would just have copied the disks while they were in the mail system. An OTP transmitted over a vulnerable channel like the postal service is not that strong, you have to exchange it in person.

You can just exchange a few floppy disks worth of random bits over various channels, e.g. some postal, some by email, some over the phone, some Diffie-Hellman key exchanges in public and so on. At the end you just XOR them all together, to get the real key. That way all of your channels have to be compromised for your encryption to break.

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