GUID number generator

[Piru]

Also you don't want to give out your MAC address.

Why not?

Lastly with your MAC address taking up so much of the space, it becomes much easier to guess what the next number will be.

I agree it would be stupid to use mac address as the sole seed for a RNG, but it certainly can be part of it. Certainly I can't see how adding some bits could make it less secure (especially when often the other party cannot predict what the bits are).

[Piru]

I think the worry comes from virus makers LOL, apparently the melissa worm creator was identified as the worm held a GUID from his machine. With the predictable way the GUIDs are created, they were able to tell which machine created it at what time.

Never quite gotten the paranoia with MAC addresses either. Each time you see some screenshot MAC is blurred out :-?

I understand that Playstation3 hackers blur theirs out so that Sony can´t find them. But I can´t see how anyone can do an ID theft using your MAC address.

I'd only hide my wireless device mac address, and mostly because of this:
http://samy.pl/mapxss/