Mark Smith wrote:

I'm not familiar with the resolution of NTP, but I'd suspect it would be
something like milliseconds.


Sure, but nobody is going to type their birthday in to the millisecond. w.r.t the time stamp, part of it (the seconds part) is likely to be quite correlated between sites, and the lower part (micro-seconds) is more likely to be a randomly distributed number.

Now we could just go random and invoke RFC1750 and be done with it (a la NUSLA).
Unfortunately, people seem to implemented random number generators really badly.


I'd think it is pretty unlikely that two people, at separate sites, with
the same birthday, were executing this algorithm at the same
millisecond.


It is even less likely that the MAC address that came from an ethernet card will be the same in both sites..

- aidan


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