[Talk] How secure is wireless, in practical terms?

[Lawrence Kagan]

One more thing, if the site you're on is using ssl (I'm sure it is),  
AFAIK, it takes a relatively long time to crack ssl encryption.  So  
the transaction itself is pretty secure, even is the network is not.   
Although, if the cracker has gained access to your network and has  
the mac addresses, he could be running a man-in-the-middle attack by  
spoofing the mac of your router, then your requests would be going  
through an otherwise transparent proxy.  The proxy could then be  
running ethereal (patched with ssl decryption) to view your information.

Man, am I paranoid or what?

Larry