One other point I just looked up - while /dev/urandom isn't /truly/ random,
it's still an extremely good source of randomness. It keeps an internal state
that's influenced by truly random numbers, then runs it through the SHA1 hash.
So unless you're worried about SHA1 being broken, which almost nobody is, it's
totally fine to use it for anything you'd use /dev/random for.
-J
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