A single visit or even a walk-by can reveal a lot too. As I understand it, SSID probing basically reveals all the networks your device knows about to any AP [1]

A single visit or even a walk-by can reveal a lot too. As I understand it, SSID probing basically reveals all the networks your device knows about to any AP [1]. This can give away a lot of information too. [1] http://blog.rootshell.be/2012/01/12/show-me-your-ssids-ill-tell-who-you-are/ http://blog.rootshell.be/2012/01/12/show-me-your-ssids-ill-t...