It's actually pretty easy to set up the encryption that comes with these things, which is called WEP (Wired Equivalence Protection).

http://techupdate.zdnet.com/techupdate/stories/main/0,14179,2803615,00.html

So which is easier, hacking the WEP key, or spoofing a card's MAC address? Is the latter even possible?
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Tony Fabris