I've heard of agencies that use random atmospheric noise as the seed.
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Right, there's "true" random and "pseudo" random. The latter is what can be algorithmically generated. A bad seed can compromise the whole thing to an attack while even a good seed isn't "technically" random, but generally "good enough". If true random is needed, can be done.
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Lava lamps.
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Atomic decay (requires a sufficient sample). This is the only thing I know of that can be totally random and also the most precise, regular known clock.
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