Okay, even more interesting: /dev/urandom *does* deplete the available entropy
as well. cat /dev/urandom >/dev/null and watch entropy_avail and you'll see
that it sits at 0. So just having something that's regularly pulling data out
of /dev/random (ssh, OpenSSL, gpg, Apache-ssl, etc.) could well be enough to
keep you depleted. /dev/urandom should still be quite safe, but /dev/random
would block.
-J
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