On Thursday 04 Oct 2007, [EMAIL PROTECTED] wrote:
> Thoughts?

Someone asked on the newsgroup a few months back.
The up shot is you can't.
Even if you have a Java app that reads the NIC's MAC, it's trivial to change 
the MAC through software.
Ditto a hardware hash.

It depends what the likely attack method / threat profile is really as to how 
far you go.
Even if you took the non preferred option of requiring email address, and a 
click on a link you email them, that trivial for an attacked to automate. For 
instance.

-- 
Tom Chiverton
Helping to conveniently industrialize front-end eyeballs
on: http://thefalken.livejournal.com

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