Warchalkers take advantage of the growing popularity of a wireless networking standard called 802.11b, more commonly referred to as "Wi-Fi." Many businesses and homes are installing Wi-Fi networks that allow computers to connect to each other and to share Internet access.

Encryption and password schemes can be used to secure the wireless connections against unauthorised users, but some Wi-Fi network operators don't know to establish those safeguards, leaving their network open to anyone with a Wi-Fi card.

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