[Q]:Generate Unique ID's

[Yan Weng]

well, MAC address is unique. It depends on the ethernet card, which is
unique. So the location is unique.
Since you can't stand in the "same" river at different time, the "MAC
address + time" gives you unique ID.
For this situation, we must use the accurate time.

And if I am not wrong, this is the mechanism by which Microsoft creates
unique COM ID.

"Paul Rubin" <http://phr.cx@NOSPAM.invalid> wrote in message
news:7xy90vj1st.fsf at ruckus.brouhaha.com...
> "Yan Weng" <yweng at cs.uoregon.edu> writes:
> > "mac address + time " is definetely unique.
>
> Since neither the mac address nor the time is necessarily unique,
> it follows that the combination isn't necessarily unique.  It's really
> best to try to find some physical entropy in the system (e.g. from an
> OS-provided security RNG) and use it.