In order to prevent other computer in the area using your Internet connection, you need to encrypt your Wi-Fi signal.
There are several encryption methods of wireless settings, including WEP, WPA-Personal, WPA and WPA2 (Wi-Fi Protected Access version 2). WEP is a basic encryption, so the least secure (that is, it can easily crack *, but with a wide range of including older hardware, and WPA2 is the most secure, but only made since 2006 and compatible hardware devices.
To enable encryption on your wireless network, turn on your wireless security settings on the router's configuration page. This will usually let you choose what you want to select, and security method if your old device, select WEP or WPA2. Enter the password to access the network; be sure to set this to something for others to guess, and taken into account in password use a combination of letters, numbers, and special characters.
Do the bad guys use-AirCrack and coWPAtty is a free tool that allows even non-hackers cracked WEP/WPA (PSK) key technology of using a dictionary attack or violence. Videos on YouTube shows could easily use AirCrack break WiFi encryption using a jailbroken iPhone or iPod Touch.
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