XChaCha20-Poly1305 is for the case where you don't have a way to guarantee a unique nonce. How would you choose one?
Hash collisions exist. RNG collisions exist. So you can't use hashes or RNGs if you want it to be impossible, right?
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So state/timestamp || host ID/process ID works, but requires huge assumptions about architecture.
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and I'd rather risk a hash or random collision than an assumption :)
End of conversation
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