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With quantum tokens, law enforcement have to crack your physical devices, so they at least have to good-old-fashion bug your devices. With classical schemes, they can intercept on the way.

I wouldn't say that current side-channels, most certainly enabled by hardware, not software, are easier to audit.

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I don't think that's true. If you're paranoid you can build a very simple and easy to audit device that lets packets through exactly every x microseconds, with a short buffer to prevent timing via dropouts.

Works fine for digital, doesn't work for quantum stuff.

“lawful intercept” can be mandated to be built into anything

Yes, but it's much easier to see it in hardware than in software.

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