"AirSnort uses a completely passive attack: An AirSnort
user needs only a Linux-operated computer with a wireless network
card, and access to whatever wireless network he or she wishes to
Many wireless networks allow amazingly easy access to
unauthorized users, as some have discovered when their laptops
suddenly connect to the Internet when they are in or near a
building that has a wireless network.
"I've been able to connect to networks when standing outside of
businesses, hospitals or Internet cafés that offer the
service," said Mark Denon, a freelance technology writer."