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Theoretically you could use quantum key distribution, but in practice this usually requires a fiber-optic connection. https://en.wikipedia.org/wiki/Quantum_key

Theoretically you could use quantum key distribution, but in practice this usually requires a fiber-optic connection. https://en.wikipedia.org/wiki/Quantum_key_distribution https://en.wikipedia.org/wiki/Quantum_key_distribution Edit: Nope, I am wrong, as the comments below point out.

sp332 11y ago
Even with QKD, an attacker that just passes data along without trying to read or change it is nearly undetectable.
Strilanc 11y ago
I don't see how that helps. QKD stops eavesdroppers, not amplifiers.