The WEP key is a encryption key code, it is configured in the wireless settings on the wireless router. This WEP key is then used to configure the wireless card in the laptop/computer to allow the laptop/computer to connect to the wireless router and Internet.
WPA and WPA2 is the latest encryption method and is much stronger than the older WEP. I suggest you use the latest encryption method.
For details on how to secure your wireless network from unauthorized access, please click on this link and follow my instructions :-
http://www.fixya.com/support/r3559128-wireless_router_security
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