Looks like I'm in the minority in this one. I believe that using someone else's wifi network, unsecured or not, without permission is essentially trespassing. To me, it would be the same as walking down the street testing for unlocked doors and when one is found you walk in and use their TV or telephone to do your business. I don't think people intentionally leave their networks unsecured, I believe it's more a matter of education and understanding the implications of not securing your AP. I would venture to guess that 80-85% of all wifi users have no clue about wireless security so they either a) see no need for it, or b) feel it's too complicated to set up.
No if all wifi AP's displayed a banner, that the user could modify, for all previously unregistered MAC addresses, people would know for a fact that they could jump on someone's wireless AP. Alternatively, if wifi manufacturers preconfigured all AP's to not broadcast their SID we really wouldn't have to worry about casual users "borrowing" their neighbors AP's and all users caught "borrowing an AP then would be liable for trespass as they would have had to have had some means for obtaining the SSID of the AP unless the owner explicitly gave it to them.
Sorry, but that's my opinion and no my AP is as locked down as it can be without my house being in a Faraday Cage.
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