I should also point out, because of the amount of wireless traffic around some hotspots, wireless encryption should not be trusted. There is software available capable of decrypting WEP encryption in about 2 hours, and capturing all the packets during the decryption process to allow all those messages to be decoded. Properly implemented SSL or SSH should give you the greatest protection against eavesdropping.

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The best way to learn anything, is to question everything.